CriticalCVE-2023-4911

Glibc: buffer overflow in ld.so leading to privilege escalation (CVE-2023-4911)

Published 03.10.2023Last modified 14.10.2026In CISA KEV since 21.11.2023Sources: SingCERT, pwn.watch, Siemens ProductCERT, CVE.org, Debian

What is affected, what to do

A buffer overflow was discovered in the GNU C Library's dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable. This issue could allow a local attacker to use maliciously crafted GLIBC_TUNABLES environment variables when launching binaries with SUID permission to execute code with elevated privileges.

The vulnerability is being actively exploited; treat it as a priority. Update Glibc to version 2.39, Red Hat Enterprise Linux 8 to version 0:2.28-225.el8_8.6, Red Hat Enterprise Linux 8.6 Extended Update Support to version 0:2.28-189.6.el8_6. Immediate actions, mitigation and detection rules are in the runbook below.

Affected: Glibc lt 2.34..2.39
Red Hat Enterprise Linux 8 lt *..0:2.28-225.el8_8.6
Red Hat Enterprise Linux 8.6 Extended Update Support lt *..0:2.28-189.6.el8_6
Red Hat Enterprise Linux 9 lt *..0:2.34-60.el9_2.7
Red Hat Enterprise Linux 9.0 Extended Update Support lt *..0:2.34-28.el9_0.4
Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 lt *..0:2.28-189.6.el8_6
Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 lt *..0:4.5.3-10.el8ev
Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 lt *..0:4.5.3-202312060823_8.6
Fixed in: Glibc 2.39
Red Hat Enterprise Linux 8 0:2.28-225.el8_8.6
Red Hat Enterprise Linux 8.6 Extended Update Support 0:2.28-189.6.el8_6
Red Hat Enterprise Linux 9 0:2.34-60.el9_2.7
Red Hat Enterprise Linux 9.0 Extended Update Support 0:2.34-28.el9_0.4
Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 0:2.28-189.6.el8_6
Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 0:4.5.3-10.el8ev
Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 0:4.5.3-202312060823_8.6

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

7.8

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: NVD, CVSS v3

7.8

CVSS v3

Severity High on the scale from 0 to 10.

Source: SingCERT, pwn.watch, Siemens ProductCERT, CVE.org, Debian

63.8 %

EPSS score

High — model estimates ≥ 50% chance of real-world exploitation within 30 days.

Source: FIRST EPSS, percentile 99.22

Show all metrics

Severity: Critical
Priority (0–325) The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first? Read in glossary: 221.32 Methodology
Exploit maturity An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack. Read in glossary: actively exploitedSource: CSA/SingCERT How we classify
XIEM Effective CVSS XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command. Read in glossary: 7.8 Methodology
CVSS v3 CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions. Read in glossary: 7.8
EPSS score The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“. Read in glossary: 63.8 %; High — model estimates ≥ 50% chance of real-world exploitation within 30 days.
EPSS percentile The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking. Read in glossary: 99.22; Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
KEV status The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: Actively exploited
Published: 03.10.2023
In CISA KEV since The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: 21.11.2023
CWE CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect. Read in glossary: CWE-122

Response and mitigation

Why act now?

Prioritisation rationale

Looney Tunables has been a staple of Linux post-exploitation toolkits since it landed on KEV, because it reliably escalates to root on virtually every unpatched mainstream distribution and needs no network reachability. Exploitation likelihood is among the very highest in the KEV catalogue, even though CISA has not flagged ransomware use — the vector typically appears in the second stage after initial access via a webshell, a stolen developer credential, or a container breakout. Prioritise multi-user hosts, shared hosting, CI/CD runners and container hosts over single-purpose appliances; isolated embedded systems without local login can wait. Treat it operationally as a critical LPE: 72-hour patch SLA for exposed multi-user systems, 14 days for the rest.

01
Runbook step 1
Immediate response (0-24 h)
- Deploy the glibc patch immediately: RHEL 8 to glibc-2.28-225.el8_8.6 (EUS 2.28-189.6.el8_6), RHEL 9 to glibc-2.34-60.el9_2.7 (EUS 2.34-28.el9_0.4), upstream to glibc 2.39 or a backported fix. RHEL 6/7 are EOL — migrate or purchase ELS.
- Reboot after patching, or at minimum restart every SUID binary and long-running process, because the vulnerable ld.so code is executed at process start. Use needs-restarting -r on RHEL.
- Inventory every host with interactive shell access (bastions, build servers, multi-user dev boxes, container hosts that allow exec) and patch those first — the exploit requires local access.
- Interim mitigation for unpatched hosts: load the SystemTap script from Red Hat advisory RHSA-2023:5455, which aborts processes that supply GLIBC_TUNABLES.
- Reduce the SUID attack surface: audit with find / -perm -4000 -type f and strip the SUID bit (chmod u-s) from non-essential or custom helper binaries.
02
Runbook step 2
Mitigation layers
- Endpoint hardening: mount /home, /tmp, /var/tmp, removable media and user NFS exports with nosuid,nodev so attackers cannot drop their own SUID carrier binary.
- Least privilege: restrict shell access on production boxes to named admins, set service accounts to nologin, enforce bastion-only access via SSH ForceCommand. No local shell, no exploit path.
- Rebuild container images: regenerate base images (ubi8, ubi9, debian, glibc-flavoured alpine) against patched glibc and roll pods. Run Trivy or docker scan against the registry and block vulnerable images via admission controller or Harbor policy.
- Kernel hardening: set kernel.yama.ptrace_scope=2, kernel.unprivileged_userns_clone=0, fs.protected_hardlinks=1, fs.protected_symlinks=1 to make exploit primitives and post-exploitation harder.
- EDR policy: block or at least alert on execution from user-writable paths (/tmp, /dev/shm, /home/*/.*). Verify SELinux/AppArmor is enforcing on every multi-user host.
- PCI/NIS2 scope: freeze new local account creation on unpatched systems until the patch wave is complete.
03
Runbook step 3
Detection rules
- auditd rule for processes started with unusually long or structured GLIBC_TUNABLES: -a always,exit -F arch=b64 -S execve -k glibc_tunables, then filter log events for GLIBC_TUNABLES=glibc. with length >200 bytes or duplicated =.
- Sysmon-for-Linux EID 1 (ProcessCreate): SUID binaries invoked by a user shell whose environment contains GLIBC_TUNABLES. KQL sketch: DeviceProcessEvents | where ProcessCommandLine has "GLIBC_TUNABLES" and FileName in ("su","sudo","mount","pkexec","passwd").
- EDR process-tree alert: unprivileged user → SUID binary → child /bin/sh or /bin/bash running as UID 0 within seconds. A root shell appearing where none should exist is the most reliable signature.
- Filesystem watch (auditd -w /etc/ld.so.preload -p wa, -w /etc/ld.so.conf.d/ -p wa): post-exploitation persistence often lands in loader configuration.
- Sigma shape: category: process_creation + product: linux + selection CommandLine|contains: 'GLIBC_TUNABLES=' + condition User != 'root' and TargetImage|contains_any: <SUID list>.

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2 NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management. Read in glossary: Actively exploited: treat the vulnerability as a priority in vulnerability handling under Art. 21(2)(e) NIS2. If it is exploited in your environment, check the reporting obligation under Art. 23 (early warning within 24 hours).
CRA The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates. Read in glossary: Since 11.09.2026, manufacturers of affected products with digital elements must report actively exploited vulnerabilities under Art. 14 CRA, with an early warning within 24 hours via ENISA's single reporting platform.
ISO/IEC 27001 ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security. Read in glossary: Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

Source: CSA/SingCERT, pwn.watch, siemens_advisory, cvelistv5, NVD (NIST), CISA KEV Catalog, CVE.org (MITRE), Debian Security Advisories

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
—	glibc	`2.34 – < 2.39`	`2.39`
Red Hat	Red Hat Enterprise Linux 6	`—`	—
Red Hat	Red Hat Enterprise Linux 7	`—`	—
Red Hat	Red Hat Enterprise Linux 8	`< 0:2.28-225.el8_8.6`	`0:2.28-225.el8_8.6`
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support	`< 0:2.28-189.6.el8_6`	`0:2.28-189.6.el8_6`
Red Hat	Red Hat Enterprise Linux 9	`< 0:2.34-60.el9_2.7`	`0:2.34-60.el9_2.7`
Red Hat	Red Hat Enterprise Linux 9.0 Extended Update Support	`< 0:2.34-28.el9_0.4`	`0:2.34-28.el9_0.4`
Red Hat	Red Hat Virtualization 4 for Red Hat Enterprise Linux 8	`< 0:4.5.3-10.el8ev` `< 0:4.5.3-202312060823_8.6` `< 0:2.28-189.6.el8_6`	`0:4.5.3-10.el8ev` `0:4.5.3-202312060823_8.6` `0:2.28-189.6.el8_6`
gnu	glibc	`2.34 – < 2.39`	`2.39`
netapp	ontap_select_deploy_administration_utility	`—`	—
redhat	codeready_linux_builder	`9.0`	—
redhat	codeready_linux_builder_eus	`9.2` `8.6` `9.6` `9.4`	— — — —
redhat	codeready_linux_builder_for_arm64	`9.0_aarch64`	—
redhat	codeready_linux_builder_for_arm64_eus	`8.6` `9.2_aarch64` `9.6_aarch64` `9.4_aarch64`	— — — —
redhat	codeready_linux_builder_for_ibm_z_systems	`9.0_s390x`	—
redhat	codeready_linux_builder_for_ibm_z_systems_eus	`8.6` `9.4_s390x` `9.6_s390x` `9.2_s390x`	— — — —
redhat	codeready_linux_builder_for_power_little_endian	`9.0_ppc64le`	—
redhat	codeready_linux_builder_for_power_little_endian_eus	`9.2_ppc64le` `9.6_ppc64le` `9.4_ppc64le` `8.6`	— — — —
redhat	virtualization	`4.0`	—
redhat	virtualization_host	`4.0`	—

Vendors and products

Affected operating systems

Affected operating systems

Linux	debian	debian_linux	`11.0`
Linux	debian	debian_linux	`12.0`
Linux	redhat	enterprise_linux	`8.0`
Linux	redhat	enterprise_linux	`9.0`
Linux	redhat	enterprise_linux_eus	`8.6`
Linux	redhat	enterprise_linux_eus	`9.2`
Linux	redhat	enterprise_linux_eus	`9.4`
Linux	redhat	enterprise_linux_eus	`9.6`
Linux	redhat	enterprise_linux_for_arm_64	`9.0_aarch64`
Linux	redhat	enterprise_linux_for_arm_64_eus	`8.6_aarch64`
Linux	redhat	enterprise_linux_for_arm_64_eus	`9.2_aarch64`
Linux	redhat	enterprise_linux_for_arm_64_eus	`9.4_aarch64`
Linux	redhat	enterprise_linux_for_arm_64_eus	`9.6_aarch64`
Linux	redhat	enterprise_linux_for_ibm_z_systems	`9.0_s390x`
Linux	redhat	enterprise_linux_for_ibm_z_systems_eus	`9.2_s390x`
Linux	redhat	enterprise_linux_for_ibm_z_systems_eus	`9.4_s390x`
Linux	redhat	enterprise_linux_for_ibm_z_systems_eus	`9.6_s390x`
Linux	redhat	enterprise_linux_for_ibm_z_systems_eus_s390x	`8.6`
Linux	redhat	enterprise_linux_for_power_big_endian_eus	`8.6_ppc64le`
Linux	redhat	enterprise_linux_for_power_little_endian	`9.0_ppc64le`
Linux	redhat	enterprise_linux_for_power_little_endian_eus	`9.2_ppc64le`
Linux	redhat	enterprise_linux_for_power_little_endian_eus	`9.4_ppc64le`
Linux	redhat	enterprise_linux_for_power_little_endian_eus	`9.6_ppc64le`
Linux	redhat	enterprise_linux_server_aus	`8.6`

Weakness classes (CWE)

CWE-122Heap-based Buffer Overflow
Variant
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
Entry at MITRE CWE-122

Public exploit references

Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.

Public exploit references

CISA KEV Catalog	CISA Known Exploited Vulnerability (opens in a new tab)cisa.gov	actively exploited	21.11.2023
CSA/SingCERT	Active Exploitation of High Severity Vulnerability in GNU C Library (opens in a new tab)CSA/SingCERT	actively exploited	07.11.2023
Packet Storm	glibc ld.so Local Privilege Escalation (opens in a new tab)packetstormsecurity.com	PoC (publicly reported)reported, not verified	—
Packet Storm	Glibc Tunables Privilege Escalation (opens in a new tab)packetstormsecurity.com	PoC (publicly reported)reported, not verified	—
Exploit-DB	EDB-ID 52479 (opens in a new tab)exploit-db.com	PoC (publicly reported)reported, not verified	—
PoC-in-GitHub (nomi-sec)	CVE-2023-4911 (opens in a new tab)github.com	PoC (publicly reported)reported, not verified	12.07.2026
PoC-in-GitHub (nomi-sec)	cve-2023-4911-exploit-optimized (opens in a new tab)github.com	PoC (publicly reported)reported, not verified	30.06.2026

References & sources

access.redhat.comRHSA-2023:5453Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2023:5454Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2023:5455Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2023:5476Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2024:0033Vendor advisory, x_refsource_REDHAT
access.redhat.comsecurity/cve/CVE-2023-4911Vulnerability database, x_refsource_REDHAT
bugzilla.redhat.comRHBZ#2238352Issue tracking, x_refsource_REDHAT
qualys.comLooney Tunables advisorypwn-watch
qualys.comcve-2023-4911
exploit-db.comexploits/52479
packetstormsecurity.comfiles/174986/glibc-ld.so-Local-Privilege-Escalation.htmlx_transferred
packetstormsecurity.comfiles/176288/Glibc-Tunables-Privilege-Escalation.htmlx_transferred
seclists.orgfulldisclosure/2023/Oct/11x_transferred
openwall.comlists/oss-security/2023/10/03/2x_transferred
openwall.comlists/oss-security/2023/10/03/3x_transferred
openwall.comlists/oss-security/2023/10/05/1x_transferred
openwall.comlists/oss-security/2023/10/13/11x_transferred
openwall.comlists/oss-security/2023/10/14/3x_transferred
openwall.comlists/oss-security/2023/10/14/5x_transferred
openwall.comlists/oss-security/2023/10/14/6x_transferred

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

14.10.2026Record modifiedRed Hat

New references:

and 5 more references

Show 27 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2023:5453
Reference	added	—	https://access.redhat.com/errata/RHSA-2023:5454
Reference	added	—	https://access.redhat.com/errata/RHSA-2023:5455
Reference	added	—	https://access.redhat.com/errata/RHSA-2023:5476
Reference	added	—	https://access.redhat.com/errata/RHSA-2024:0033
Reference	added	—	https://access.redhat.com/security/cve/CVE-2023-4911
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=2238352
Reference	added	—	https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt
Reference	added	—	https://www.qualys.com/cve-2023-4911/
Reference	removed	https://access.redhat.com/errata/RHSA-2023:5453	—
Reference	removed	https://access.redhat.com/errata/RHSA-2023:5454	—
Reference	removed	https://access.redhat.com/errata/RHSA-2023:5455	—
Reference	removed	https://access.redhat.com/errata/RHSA-2023:5476	—
Reference	removed	https://access.redhat.com/errata/RHSA-2024:0033	—
Reference	removed	https://access.redhat.com/security/cve/CVE-2023-4911	—
Reference	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2238352	—
Reference	removed	https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt	—
Reference	removed	https://www.qualys.com/cve-2023-4911/	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2023:5453 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2023:5454 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2023:5455 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2023:5476 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2024:0033 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/security/cve/CVE-2023-4911 Types: Third Party Advisory	—
Reference type	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2238352 Types: Issue Tracking, Patch	—
Reference type	removed	https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt Types: Exploit, Third Party Advisory	—
Reference type	removed	https://www.qualys.com/cve-2023-4911/ Types: Third Party Advisory	—

Source identifier: secalert@redhat.com

14.10.2026Record modifiedCISA ADP

New references:

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4911

Show 3 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4911
Reference	removed	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4911	—
Reference type	removed	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4911 Types: US Government Resource	—

Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

14.10.2026Record modifiedCVE Program

New references:

and 8 more references

Show 78 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html
Reference	added	—	http://packetstormsecurity.com/files/176288/Glibc-Tunables-Privilege-Escalation.html
Reference	added	—	http://seclists.org/fulldisclosure/2023/Oct/11
Reference	added	—	http://www.openwall.com/lists/oss-security/2023/10/03/2
Reference	added	—	http://www.openwall.com/lists/oss-security/2023/10/03/3
Reference	added	—	http://www.openwall.com/lists/oss-security/2023/10/05/1
Reference	added	—	http://www.openwall.com/lists/oss-security/2023/10/13/11
Reference	added	—	http://www.openwall.com/lists/oss-security/2023/10/14/3
Reference	added	—	http://www.openwall.com/lists/oss-security/2023/10/14/5
Reference	added	—	http://www.openwall.com/lists/oss-security/2023/10/14/6
Reference	added	—	https://access.redhat.com/errata/RHSA-2023:5453
Reference	added	—	https://access.redhat.com/errata/RHSA-2023:5454
Reference	added	—	https://access.redhat.com/errata/RHSA-2023:5455
Reference	added	—	https://access.redhat.com/errata/RHSA-2023:5476
Reference	added	—	https://access.redhat.com/errata/RHSA-2024:0033
Reference	added	—	https://access.redhat.com/security/cve/CVE-2023-4911
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=2238352
Reference	added	—	https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/
Reference	added	—	https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/
Reference	added	—	https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/
Reference	added	—	https://security.gentoo.org/glsa/202310-03
Reference	added	—	https://security.netapp.com/advisory/ntap-20231013-0006/
Reference	added	—	https://www.debian.org/security/2023/dsa-5514
Reference	added	—	https://www.exploit-db.com/exploits/52479
Reference	added	—	https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt
Reference	added	—	https://www.qualys.com/cve-2023-4911/
Reference	removed	http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html	—
Reference	removed	http://packetstormsecurity.com/files/176288/Glibc-Tunables-Privilege-Escalation.html	—
Reference	removed	http://seclists.org/fulldisclosure/2023/Oct/11	—
Reference	removed	http://www.openwall.com/lists/oss-security/2023/10/03/2	—
Reference	removed	http://www.openwall.com/lists/oss-security/2023/10/03/3	—
Reference	removed	http://www.openwall.com/lists/oss-security/2023/10/05/1	—
Reference	removed	http://www.openwall.com/lists/oss-security/2023/10/13/11	—
Reference	removed	http://www.openwall.com/lists/oss-security/2023/10/14/3	—
Reference	removed	http://www.openwall.com/lists/oss-security/2023/10/14/5	—
Reference	removed	http://www.openwall.com/lists/oss-security/2023/10/14/6	—
Reference	removed	https://access.redhat.com/errata/RHSA-2023:5453	—
Reference	removed	https://access.redhat.com/errata/RHSA-2023:5454	—
Reference	removed	https://access.redhat.com/errata/RHSA-2023:5455	—
Reference	removed	https://access.redhat.com/errata/RHSA-2023:5476	—
Reference	removed	https://access.redhat.com/errata/RHSA-2024:0033	—
Reference	removed	https://access.redhat.com/security/cve/CVE-2023-4911	—
Reference	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2238352	—
Reference	removed	https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/	—
Reference	removed	https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/	—
Reference	removed	https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/	—
Reference	removed	https://security.gentoo.org/glsa/202310-03	—
Reference	removed	https://security.netapp.com/advisory/ntap-20231013-0006/	—
Reference	removed	https://www.debian.org/security/2023/dsa-5514	—
Reference	removed	https://www.exploit-db.com/exploits/52479	—
Reference	removed	https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt	—
Reference	removed	https://www.qualys.com/cve-2023-4911/	—
Reference type	removed	http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html Types: Exploit, Third Party Advisory, VDB Entry	—
Reference type	removed	http://packetstormsecurity.com/files/176288/Glibc-Tunables-Privilege-Escalation.html Types: Exploit, Third Party Advisory, VDB Entry	—
Reference type	removed	http://seclists.org/fulldisclosure/2023/Oct/11 Types: Exploit, Mailing List, Third Party Advisory	—
Reference type	removed	http://www.openwall.com/lists/oss-security/2023/10/03/2 Types: Exploit, Mailing List	—
Reference type	removed	http://www.openwall.com/lists/oss-security/2023/10/03/3 Types: Mailing List	—
Reference type	removed	http://www.openwall.com/lists/oss-security/2023/10/05/1 Types: Mailing List	—
Reference type	removed	http://www.openwall.com/lists/oss-security/2023/10/13/11 Types: Mailing List	—
Reference type	removed	http://www.openwall.com/lists/oss-security/2023/10/14/3 Types: Mailing List	—
Reference type	removed	http://www.openwall.com/lists/oss-security/2023/10/14/5 Types: Mailing List	—
Reference type	removed	http://www.openwall.com/lists/oss-security/2023/10/14/6 Types: Mailing List	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2023:5453 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2023:5454 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2023:5455 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2023:5476 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2024:0033 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/security/cve/CVE-2023-4911 Types: Third Party Advisory	—
Reference type	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2238352 Types: Issue Tracking, Patch	—
Reference type	removed	https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/ Types: Mailing List	—
Reference type	removed	https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/ Types: Mailing List	—
Reference type	removed	https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/ Types: Mailing List	—
Reference type	removed	https://security.gentoo.org/glsa/202310-03 Types: Third Party Advisory	—
Reference type	removed	https://security.netapp.com/advisory/ntap-20231013-0006/ Types: Third Party Advisory	—
Reference type	removed	https://www.debian.org/security/2023/dsa-5514 Types: Mailing List	—
Reference type	removed	https://www.exploit-db.com/exploits/52479 Types: Exploit, Third Party Advisory, VDB Entry	—
Reference type	removed	https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt Types: Exploit, Third Party Advisory	—
Reference type	removed	https://www.qualys.com/cve-2023-4911/ Types: Third Party Advisory	—

Source identifier: af854a3a-2127-422b-91ae-364da2661108

14.10.2026Record modifiedSiemens ADP

New references:

Show 10 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2023/4xxx/CVE-2023-4911.json">CVE-2023-4911</a>
Reference	added	—	https://cert-portal.siemens.com/productcert/html/ssa-082556.html
Reference	added	—	https://cert-portal.siemens.com/productcert/html/ssa-794697.html
Reference	added	—	https://cert-portal.siemens.com/productcert/html/ssa-831302.html
Reference	removed	https://cert-portal.siemens.com/productcert/html/ssa-082556.html	—
Reference	removed	https://cert-portal.siemens.com/productcert/html/ssa-794697.html	—
Reference	removed	https://cert-portal.siemens.com/productcert/html/ssa-831302.html	—
Reference type	removed	https://cert-portal.siemens.com/productcert/html/ssa-082556.html Types: Third Party Advisory	—
Reference type	removed	https://cert-portal.siemens.com/productcert/html/ssa-794697.html Types: Third Party Advisory	—
Reference type	removed	https://cert-portal.siemens.com/productcert/html/ssa-831302.html Types: Third Party Advisory	—

Source identifier: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

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<a href="https://intel.neosec.eu/en/cve/CVE-2023-4911"><img src="https://intel.neosec.eu/badge/cve/CVE-2023-4911.svg?lang=en" alt="CVE-2023-4911 – NEOSEC Intel" height="20"></a>

What is affected, what to do

Metrics

Response and mitigation

Prioritisation rationale

Immediate response (0-24 h)

Mitigation layers

Detection rules

Detection rules

Classification under NIS2 and CRA

Description

Affected products

Vendors and products

Affected operating systems

Weakness classes (CWE)

Public exploit references

References & sources

Changes to this CVE