CriticalCVE-2026-53176

Linux Kernel: Numeric Range Comparison Without Minimum Check (CVE-2026-53176)

Published 25.06.2026Last modified 19.10.2026Sources: SUSE, Ubuntu, Debian LTS, BSI, Red Hat, EUVD, CVE.org, Msrc Update Guide

What is affected, what to do

Update Linux Kernel to version 5.10.259, Linux Kernel to version 5.15.210, Linux Kernel to version 6.1.176.

Affected: Linux Kernel lt 3.10..5.10.259
Linux Kernel lt 5.11..5.15.210
Linux Kernel lt 5.16..6.1.176
Linux Kernel lt 6.2..6.6.143
Linux Kernel lt 6.7..6.12.94
Linux Kernel lt 6.13..6.18.36
Linux Kernel lt 6.19..7.0.13
Fixed in: Linux Kernel 5.10.259
Linux Kernel 5.15.210
Linux Kernel 6.1.176
Linux Kernel 6.6.143
Linux Kernel 6.12.94
Linux Kernel 6.18.36
Linux Kernel 7.0.13
Linux Kernel 7.1

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

Metrics

9.8

XIEM Effective CVSS

Highest available CVSS rating from NVD and vendor data.

Source: Vendor (CNA), CVSS v3

9.8

CVSS v3

Severity Critical on the scale from 0 to 10.

Source: SUSE, Ubuntu, Debian LTS, BSI, Red Hat, EUVD, CVE.org, Msrc Update Guide

0.8 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 55.8

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: 92.60 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: no public PoC known
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: 9.8 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: 9.8
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: 0.8 %; Low — model estimates < 1% exploitation likelihood.
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: 55.8; High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
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: —
Published: 25.06.2026
CISA assessment (SSVC): Exploitation: none known · automatable · Technical impact: total; Source: CISA Vulnrichment, as of 16 October 2026
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-839

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: High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
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: From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
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

A flaw was found in the Linux kernel's Internet Small Computer System Interface (iSCSI) Extensions for Remote Direct Memory Access (RDMA) (iSER) module. A remote attacker can send a specially crafted login request with a payload shorter than expected, leading to an integer underflow. This underflow causes a negative length to be used in a memory copy operation, resulting in an out-of-bounds write that crashes the system. This vulnerability allows an unauthenticated remote attacker to cause a Denial of Service (DoS).

Source: suse_csaf, Ubuntu Security Notices, Debian LTS Advisories, BSI WID Portal, BSI CSAF, redhat_csaf, ENISA EUVD, cvelistv5, NVD (NIST), Microsoft Security Update Guide, CVE.org (MITRE)

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
Linux	Linux	`6.7 – < 6.12.94` `6.13 – < 6.18.36` `5.11 – < 5.15.210` `3.10 – < 5.10.259` `—` `5.16 – < 6.1.176` `6.19 – < 7.0.13` `6.2 – < 6.6.143`	`6.12.94` `6.18.36` `5.15.210` `5.10.259` `7.1` `6.1.176` `7.0.13` `6.6.143`

Vendors and products

Affected operating systems

Affected operating systems

Linux	ubuntu	aws	`bionic`
Linux	ubuntu	aws	`jammy`
Linux	ubuntu	aws	`noble`
Linux	ubuntu	aws	`resolute`
Linux	ubuntu	aws	`xenial`
Linux	ubuntu	aws-6.8	`jammy`
Linux	ubuntu	aws-hwe	`xenial`
Linux	ubuntu	azure	`jammy`
Linux	ubuntu	azure	`noble`
Linux	ubuntu	azure	`resolute`
Linux	ubuntu	azure	`xenial`
Linux	ubuntu	azure-4.15	`bionic`
Linux	ubuntu	gcp	`jammy`
Linux	ubuntu	gcp	`noble`
Linux	ubuntu	gcp	`resolute`
Linux	ubuntu	gcp	`xenial`
Linux	ubuntu	gcp-4.15	`bionic`
Linux	ubuntu	gcp-6.8	`jammy`
Linux	ubuntu	generic-4.15	`bionic`
Linux	ubuntu	generic-4.15	`xenial`
Linux	ubuntu	generic-4.4	`xenial`
Linux	ubuntu	generic-5.4	`bionic`
Linux	ubuntu	generic-5.4	`focal`
Linux	ubuntu	gke	`jammy`

Weakness classes (CWE)

CWE-839Numeric Range Comparison Without Minimum Check
Base
The product checks a value to ensure that it is less than or equal to a maximum, but it does not also verify that the value is greater than or equal to the minimum.
Entry at MITRE CWE-839

References & sources

git.kernel.orgstable/c/75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefbPatch, euvd
git.kernel.orgstable/c/e8a013c0c3ca2f6708341a56612a3f6d6921620aPatch, euvd
git.kernel.orgstable/c/bd22740d7f14cb1c0289444cfd2c8d2938667c1dPatch, euvd
git.kernel.orgstable/c/c1234229399f4af12c553b1b0ffd978eeba65548Patch, euvd
git.kernel.orgstable/c/c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47Patch, euvd
git.kernel.orgstable/c/df422fd273c96c2ee5beb80fc21adc8c70c29260Patch, euvd
git.kernel.orgstable/c/1ca40b243277c9e88be5e00bd3e083f71aefb93ePatch, euvd
git.kernel.orgstable/c/29e7b925ae6df64894e82ab6419994dc25580a8aPatch, euvd
access.redhat.comsecurity/cve/CVE-2026-53176Vulnerability database, x_refsource_REDHAT, Third-party advisory
bugzilla.redhat.comRHBZ#2492741Issue tracking, x_refsource_REDHAT, Issue tracking, Third-party advisory
security.access.redhat.comdata/csaf/v2/vex/2026/cve-2026-53176.jsonx_sadp-csaf-vex, Third-party advisory
access.redhat.comerrata/RHSA-2026:68532Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:68507Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:68570Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:68531Vendor advisory, x_refsource_REDHAT

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).

19.10.2026Record modifiedCISA ADP
Weakness type: CWE-839
Show the original change
Individual changes of this event as published by NVD
Type Action Before After
Weakness type (CWE) added
—
CWE-839
Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Individual changes of this event as published by NVD
Type	Action	Before	After
Weakness type (CWE)	added	—	CWE-839

16.10.2026Record modifiedCISA ADP

CISA assessment (SSVC): exploitation: none known, automatable: yes

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
SSVC assessment	added	—	{"id":"CVE-2026-53176","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:26:06.476116Z"}

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

18.09.2026Record modifiedRed Hat ADP

New references:

Show 4 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/2026/53xxx/CVE-2026-53176.json">CVE-2026-53176</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:68507
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:68531
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:68570

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

17.09.2026Record modifiedLinux

New references:

and 4 more references

Show 24 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://git.kernel.org/stable/c/1ca40b243277c9e88be5e00bd3e083f71aefb93e
Reference	added	—	https://git.kernel.org/stable/c/29e7b925ae6df64894e82ab6419994dc25580a8a
Reference	added	—	https://git.kernel.org/stable/c/75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb
Reference	added	—	https://git.kernel.org/stable/c/bd22740d7f14cb1c0289444cfd2c8d2938667c1d
Reference	added	—	https://git.kernel.org/stable/c/c1234229399f4af12c553b1b0ffd978eeba65548
Reference	added	—	https://git.kernel.org/stable/c/c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47
Reference	added	—	https://git.kernel.org/stable/c/df422fd273c96c2ee5beb80fc21adc8c70c29260
Reference	added	—	https://git.kernel.org/stable/c/e8a013c0c3ca2f6708341a56612a3f6d6921620a
Reference	removed	https://git.kernel.org/stable/c/1ca40b243277c9e88be5e00bd3e083f71aefb93e	—
Reference	removed	https://git.kernel.org/stable/c/29e7b925ae6df64894e82ab6419994dc25580a8a	—
Reference	removed	https://git.kernel.org/stable/c/75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb	—
Reference	removed	https://git.kernel.org/stable/c/bd22740d7f14cb1c0289444cfd2c8d2938667c1d	—
Reference	removed	https://git.kernel.org/stable/c/c1234229399f4af12c553b1b0ffd978eeba65548	—
Reference	removed	https://git.kernel.org/stable/c/c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47	—
Reference	removed	https://git.kernel.org/stable/c/df422fd273c96c2ee5beb80fc21adc8c70c29260	—
Reference	removed	https://git.kernel.org/stable/c/e8a013c0c3ca2f6708341a56612a3f6d6921620a	—
Reference type	removed	https://git.kernel.org/stable/c/1ca40b243277c9e88be5e00bd3e083f71aefb93e Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/29e7b925ae6df64894e82ab6419994dc25580a8a Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/bd22740d7f14cb1c0289444cfd2c8d2938667c1d Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/c1234229399f4af12c553b1b0ffd978eeba65548 Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47 Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/df422fd273c96c2ee5beb80fc21adc8c70c29260 Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/e8a013c0c3ca2f6708341a56612a3f6d6921620a Types: Patch	—

Source identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

17.09.2026Record modifiedRed Hat ADP

New references:

Show 10 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:68532
Reference	added	—	https://access.redhat.com/security/cve/CVE-2026-53176
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=2492741
Reference	added	—	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53176.json
Reference	removed	https://access.redhat.com/security/cve/CVE-2026-53176	—
Reference	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2492741	—
Reference	removed	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53176.json	—
Reference type	removed	https://access.redhat.com/security/cve/CVE-2026-53176 Types: Third Party Advisory	—
Reference type	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2492741 Types: Issue Tracking, Third Party Advisory	—
Reference type	removed	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53176.json Types: Third Party Advisory	—

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Show one older change

06.07.2026Initial analysis by NVDNVD

Newly listed as affected:

Linux Kernel (5.16 – before 6.1.176; 6.2 – before 6.6.143; 5.11 – before 5.15.210; 6.13 – before 6.18.36; 6.7 – before 6.12.94; 6.19 – before 7.0.13; 3.10 – before 5.10.259; 7 individual versions)

Weakness type: CWE-191

New references:

and 7 more references

Show 13 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Weakness type (CWE)	added	—	CWE-191
Product configuration	added	—	OR cpe:2.3:o:linux:linux_kernel:7.1:rc1::::::* cpe:2.3:o:linux:linux_kernel:7.1:rc2::::::* cpe:2.3:o:linux:linux_kernel:7.1:rc3::::::* cpe:2.3:o:linux:linux_kernel:7.1:rc4::::::* cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 5.16 up to (excluding) 6.1.176 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.2 up to (excluding) 6.6.143 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 5.11 up to (excluding) 5.15.210 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.13 up to (excluding) 6.18.36 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.7 up to (excluding) 6.12.94 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.19 up to (excluding) 7.0.13 cpe:2.3:o:linux:linux_kernel:7.1:rc5::::::* cpe:2.3:o:linux:linux_kernel:7.1:rc6::::::* cpe:2.3:o:linux:linux_kernel:7.1:rc7::::::* cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 3.10 up to (excluding) 5.10.259
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/1ca40b243277c9e88be5e00bd3e083f71aefb93e Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/29e7b925ae6df64894e82ab6419994dc25580a8a Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/bd22740d7f14cb1c0289444cfd2c8d2938667c1d Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/c1234229399f4af12c553b1b0ffd978eeba65548 Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47 Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/df422fd273c96c2ee5beb80fc21adc8c70c29260 Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/e8a013c0c3ca2f6708341a56612a3f6d6921620a Types: Patch
Reference type	added	—	redhat-SADP: https://access.redhat.com/security/cve/CVE-2026-53176 Types: Third Party Advisory
Reference type	added	—	redhat-SADP: https://bugzilla.redhat.com/show_bug.cgi?id=2492741 Types: Issue Tracking, Third Party Advisory
Reference type	added	—	redhat-SADP: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53176.json Types: Third Party Advisory

Source identifier: nvd@nist.gov

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