HighCVE-2026-46227

Linux Kernel: Use-After-Free (CVE-2026-46227)

Published 28.05.2026Last modified 19.10.2026Sources: Debian LTS, BSI, SUSE, Ubuntu, Siemens ProductCERT, Red Hat, CVE.org, Msrc Update Guide, EUVD

What is affected, what to do

Update Linux Kernel to version 5.10.258, Linux Kernel to version 5.15.209, Linux Kernel to version 6.1.175.

Affected: Linux Kernel lt 4.17..5.10.258
Linux Kernel lt 5.11..5.15.209
Linux Kernel lt 5.16..6.1.175
Linux Kernel lt 6.2..6.6.140
Linux Kernel lt 6.7..6.12.90
Linux Kernel lt 6.13..6.18.32
Linux Kernel lt 6.19..7.0.9
Fixed in: Linux Kernel 5.10.258
Linux Kernel 5.15.209
Linux Kernel 6.1.175
Linux Kernel 6.6.140
Linux Kernel 6.12.90
Linux Kernel 6.18.32
Linux Kernel 7.0.9
Linux Kernel 7.1

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: Vendor (CNA), CVSS v3

7.8

CVSS v3

Severity High on the scale from 0 to 10.

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

0.1 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 1.0

Show all metrics

Severity: High
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: 56.92 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: 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: 0.1 %; 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: 1.0; Low — this CVE sits in the lower 10% of all CVEs scored today.
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: 28.05.2026
CISA assessment (SSVC): Exploitation: none known · not 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-362

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 Stream Control Transmission Protocol (SCTP) implementation. A race condition exists in the `SCTP_SENDALL` path where a cached list entry is not properly revalidated after the socket lock is temporarily released. This allows a local attacker or a remote attacker (via a network abort) to trigger a use-after-free or type confusion vulnerability. Successful exploitation can lead to a controlled indirect call, potentially resulting in arbitrary code execution.

Source: Debian LTS Advisories, BSI WID Portal, BSI CSAF, suse_csaf, Ubuntu Security Notices, siemens_advisory, redhat_csaf, cvelistv5, Microsoft Security Update Guide, NVD (NIST), ENISA EUVD, 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	`5.16 – < 6.1.175` `4.17 – < 5.10.258` `6.2 – < 6.6.140` `6.19 – < 7.0.9` `6.13 – < 6.18.32` `5.11 – < 5.15.209` `—` `6.7 – < 6.12.90`	`6.1.175` `5.10.258` `6.6.140` `7.0.9` `6.18.32` `5.15.209` `7.1` `6.12.90`
IBM	QRadar SIEM	`<7.5.0 UP15 IF06`	—
Siemens	SIMATIC S7	`1500 TM MFP V1.1.1 GNU/Linux subsystem`	—

Vendors and products

Affected operating systems

Affected operating systems

Linux	debian	linux	`bookworm`
Linux	debian	linux	`bullseye`
Linux	debian	linux-6.1	`bullseye`
Linux	linux	linux_kernel	`7.1`
Linux	linux	linux_kernel	—

Weakness classes (CWE)

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Class
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
Entry at MITRE CWE-362

References & sources

git.kernel.orgstable/c/1bfb06ecb00f7fdf35dba8e8f2877346cbe5e078euvd, Patch
git.kernel.orgstable/c/6187a172d6ed57d6b2c327836e4407c6456e639deuvd, Patch
git.kernel.orgstable/c/c9dadb31f36045a8cb65df4bd75e7237ef21a4b5euvd, Patch
git.kernel.orgstable/c/bf0f40d8107e2ce827521968dc6926f3e13728aeeuvd, Patch
git.kernel.orgstable/c/abb5f36771cc4c05899b34000829a787572a8817euvd, Patch
git.kernel.orgstable/c/f3a3f0b406b4b7eb3cea35a23fa2bf170848b104Patch
git.kernel.orgstable/c/0dbc8cde64280fc37cdd678cced34eaf96cfb197Patch
git.kernel.orgstable/c/0c7b55974f97b78d1109025eadf084e74cbf330fPatch
access.redhat.comsecurity/cve/CVE-2026-46227Vulnerability database, x_refsource_REDHAT
bugzilla.redhat.comRHBZ#2482564Issue tracking, x_refsource_REDHAT
security.access.redhat.comdata/csaf/v2/vex/2026/cve-2026-46227.jsonx_sadp-csaf-vex
access.redhat.comerrata/RHSA-2026:27731Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:36956Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:26515Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:27735Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:34094Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:36018Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:59143Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:36349Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:59146Vendor 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-362
Show the original change
Individual changes of this event as published by NVD
Type Action Before After
Weakness type (CWE) added
—
CWE-362
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-362

16.10.2026Record modifiedCISA ADP

CISA assessment (SSVC): exploitation: none known, automatable: no

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
SSVC assessment	added	—	{"id":"CVE-2026-46227","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:21:13.490771Z"}

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

15.10.2026Record 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/0c7b55974f97b78d1109025eadf084e74cbf330f
Reference	added	—	https://git.kernel.org/stable/c/0dbc8cde64280fc37cdd678cced34eaf96cfb197
Reference	added	—	https://git.kernel.org/stable/c/1bfb06ecb00f7fdf35dba8e8f2877346cbe5e078
Reference	added	—	https://git.kernel.org/stable/c/6187a172d6ed57d6b2c327836e4407c6456e639d
Reference	added	—	https://git.kernel.org/stable/c/abb5f36771cc4c05899b34000829a787572a8817
Reference	added	—	https://git.kernel.org/stable/c/bf0f40d8107e2ce827521968dc6926f3e13728ae
Reference	added	—	https://git.kernel.org/stable/c/c9dadb31f36045a8cb65df4bd75e7237ef21a4b5
Reference	added	—	https://git.kernel.org/stable/c/f3a3f0b406b4b7eb3cea35a23fa2bf170848b104
Reference	removed	https://git.kernel.org/stable/c/0c7b55974f97b78d1109025eadf084e74cbf330f	—
Reference	removed	https://git.kernel.org/stable/c/0dbc8cde64280fc37cdd678cced34eaf96cfb197	—
Reference	removed	https://git.kernel.org/stable/c/1bfb06ecb00f7fdf35dba8e8f2877346cbe5e078	—
Reference	removed	https://git.kernel.org/stable/c/6187a172d6ed57d6b2c327836e4407c6456e639d	—
Reference	removed	https://git.kernel.org/stable/c/abb5f36771cc4c05899b34000829a787572a8817	—
Reference	removed	https://git.kernel.org/stable/c/bf0f40d8107e2ce827521968dc6926f3e13728ae	—
Reference	removed	https://git.kernel.org/stable/c/c9dadb31f36045a8cb65df4bd75e7237ef21a4b5	—
Reference	removed	https://git.kernel.org/stable/c/f3a3f0b406b4b7eb3cea35a23fa2bf170848b104	—
Reference type	removed	https://git.kernel.org/stable/c/0c7b55974f97b78d1109025eadf084e74cbf330f Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/0dbc8cde64280fc37cdd678cced34eaf96cfb197 Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/1bfb06ecb00f7fdf35dba8e8f2877346cbe5e078 Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/6187a172d6ed57d6b2c327836e4407c6456e639d Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/abb5f36771cc4c05899b34000829a787572a8817 Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/bf0f40d8107e2ce827521968dc6926f3e13728ae Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/c9dadb31f36045a8cb65df4bd75e7237ef21a4b5 Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/f3a3f0b406b4b7eb3cea35a23fa2bf170848b104 Types: Patch	—

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

15.10.2026Record modifiedRed Hat ADP

New references:

and 8 more references

Show 44 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:26462
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:26515
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:26535
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:26563
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:27731
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:27735
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:33899
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:34094
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36018
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36348
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36349
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36956
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59142
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59143
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59145
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59146
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59147
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59148
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59149
Reference	added	—	https://access.redhat.com/security/cve/CVE-2026-46227
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=2482564
Reference	added	—	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46227.json
Reference	removed	https://access.redhat.com/errata/RHSA-2026:26462	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:26515	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:26535	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:26563	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:27731	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:27735	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:33899	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:34094	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36018	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36348	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36349	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36956	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:59142	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:59143	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:59145	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:59146	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:59147	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:59148	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:59149	—
Reference	removed	https://access.redhat.com/security/cve/CVE-2026-46227	—
Reference	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2482564	—
Reference	removed	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46227.json	—

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

15.10.2026Record modifiedSiemens ADP

New references:

https://cert-portal.siemens.com/productcert/html/ssa-784472.html

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/46xxx/CVE-2026-46227.json">CVE-2026-46227</a>
Reference	added	—	https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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

Show 3 older changes

25.08.2026Record modifiedRed Hat ADP

New references:

and 3 more references

Show 7 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59142
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59143
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59145
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59146
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59147
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59148
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59149

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

09.07.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:36956

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36956
Affected versions (publisher)	changed	Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux AppStream E4S (v.9.4) (+33)	Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream E4S (v.9.2) (+37)

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

10.06.2026Initial analysis by NVDNVD

Newly listed as affected:

Linux Kernel (5.16 – before 6.1.175; 5.11 – before 5.15.209; 6.2 – before 6.6.140; 6.13 – before 6.18.32; 6.7 – before 6.12.90; 6.19 – before 7.0.9; 4.17 – before 5.10.258; 3 individual versions)

Weakness type: CWE-416

New references:

and 4 more references

Show 10 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Weakness type (CWE)	added	—	CWE-416
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::::::::* versions from (including) 5.16 up to (excluding) 6.1.175 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 5.11 up to (excluding) 5.15.209 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.2 up to (excluding) 6.6.140 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.13 up to (excluding) 6.18.32 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.7 up to (excluding) 6.12.90 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.19 up to (excluding) 7.0.9 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 4.17 up to (excluding) 5.10.258
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/0c7b55974f97b78d1109025eadf084e74cbf330f Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/0dbc8cde64280fc37cdd678cced34eaf96cfb197 Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/1bfb06ecb00f7fdf35dba8e8f2877346cbe5e078 Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/6187a172d6ed57d6b2c327836e4407c6456e639d Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/abb5f36771cc4c05899b34000829a787572a8817 Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/bf0f40d8107e2ce827521968dc6926f3e13728ae Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/c9dadb31f36045a8cb65df4bd75e7237ef21a4b5 Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/f3a3f0b406b4b7eb3cea35a23fa2bf170848b104 Types: Patch

Source identifier: nvd@nist.gov

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<a href="https://intel.neosec.eu/en/cve/CVE-2026-46227"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-46227.svg?lang=en" alt="CVE-2026-46227 – NEOSEC Intel" height="20"></a>