HighCVE-2026-46323

Linux Kernel: security vulnerability (CVE-2026-46323)

Published 09.06.2026Last modified 19.10.2026Sources: SUSE, Siemens ProductCERT, Ubuntu, Debian LTS, Red Hat, Debian, BSI, CVE.org, Msrc Update Guide

What is affected, what to do

Update Linux Kernel to version 6.1.176, Linux Kernel to version 6.6.142, Linux Kernel to version 6.12.92.

Affected: Linux Kernel lt 6.0..6.1.176
Linux Kernel lt 6.2..6.6.142
Linux Kernel lt 6.7..6.12.92
Linux Kernel lt 6.13..6.18.34
Linux Kernel lt 6.19..7.0.11
Fixed in: Linux Kernel 6.1.176
Linux Kernel 6.6.142
Linux Kernel 6.12.92
Linux Kernel 6.18.34
Linux Kernel 7.0.11
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: NVD, CVSS v3

7.8

CVSS v3

Severity High on the scale from 0 to 10.

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

0.1 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 3.1

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: 57.73 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: 3.1; 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: 09.06.2026
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-416

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 Generic Receive Offload (GRO) networking subsystem. This vulnerability occurs when `skb_gro_receive()` attempts to merge zerocopy socket buffers (skbs) without properly managing page reference counts, specifically when the `SKBFL_MANAGED_FRAG_REFS` flag is set. An attacker could potentially exploit this to trigger a Use-After-Free (UAF) condition, which is a memory corruption vulnerability that can lead to system instability or potentially arbitrary code execution.

Source: suse_csaf, siemens_advisory, Ubuntu Security Notices, Debian LTS Advisories, redhat_csaf, Debian Security Advisories, BSI WID Portal, BSI CSAF, 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	`6.19 – < 7.0.11` `6.0 – < 6.1.176` `6.13 – < 6.18.34` `—` `6.7 – < 6.12.92` `6.2 – < 6.6.142`	`7.0.11` `6.1.176` `6.18.34` `7.1` `6.12.92` `6.6.142`
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	`trixie`
Linux	debian	linux-6.1	`bullseye`
Linux	linux	linux_kernel	`7.1`
Linux	linux	linux_kernel	—

Weakness classes (CWE)

CWE-416Use After Free
Variant
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
Entry at MITRE CWE-416

References & sources

git.kernel.orgstable/c/1f9c828556416fbe3f49386708ce999fc4d4da06Patch
git.kernel.orgstable/c/479084ae0e1d9cb7929cb4298d35623de189f80aPatch
git.kernel.orgstable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71Patch
git.kernel.orgstable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1Patch
git.kernel.orgstable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40Patch
git.kernel.orgstable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8dPatch
access.redhat.comsecurity/cve/CVE-2026-46323Vulnerability database, x_refsource_REDHAT, Third-party advisory
bugzilla.redhat.comRHBZ#2479832Issue tracking, x_refsource_REDHAT, Third-party advisory
security.access.redhat.comdata/csaf/v2/vex/2026/cve-2026-46323.jsonx_sadp-csaf-vex, Third-party advisory
access.redhat.comerrata/RHSA-2026:47727Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:44230Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:44231Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:44259Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:44262Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:27731Vendor advisory, x_refsource_REDHAT, Third-party advisory
access.redhat.comerrata/RHSA-2026:44270Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:27735Vendor advisory, x_refsource_REDHAT, Third-party advisory
access.redhat.comerrata/RHSA-2026:27708Vendor advisory, x_refsource_REDHAT, Third-party advisory
access.redhat.comerrata/RHSA-2026:36018Vendor advisory, x_refsource_REDHAT, Third-party advisory
access.redhat.comerrata/RHSA-2026:62642Vendor 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-416
Show the original change
Individual changes of this event as published by NVD
Type Action Before After
Weakness type (CWE) added
—
CWE-416
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-416

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-2026-46323","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:22:07.402630Z"}

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

15.10.2026Record modifiedSiemens ADP

New references:

Show 3 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/2026/46xxx/CVE-2026-46323.json">CVE-2026-46323</a>
Reference	added	—	https://cert-portal.siemens.com/productcert/html/ssa-457936.html
Reference	added	—	https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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

08.09.2026Record modifiedSiemens ADP

New references:

https://cert-portal.siemens.com/productcert/html/ssa-019113.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-2026-46323.json">CVE-2026-46323</a>
Reference	added	—	https://cert-portal.siemens.com/productcert/html/ssa-019113.html

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

03.09.2026Record modifiedRed Hat ADP

New references:

Show 5 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/2026/46xxx/CVE-2026-46323.json">CVE-2026-46323</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:62639
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:62640
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:62641
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:62642

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

Show 6 older changes

01.09.2026Record modifiedLinux

New references:

and 2 more references

Show 18 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06
Reference	added	—	https://git.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d
Reference	added	—	https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1
Reference	added	—	https://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80a
Reference	added	—	https://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40
Reference	added	—	https://git.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71
Reference	removed	https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06	—
Reference	removed	https://git.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d	—
Reference	removed	https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1	—
Reference	removed	https://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80a	—
Reference	removed	https://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40	—
Reference	removed	https://git.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71	—
Reference type	removed	https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06 Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1 Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80a Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40 Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71 Types: Patch	—

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

01.09.2026Record modifiedRed Hat ADP

New references:

and 8 more references

Show 34 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/2026/46xxx/CVE-2026-46323.json">CVE-2026-46323</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:27708
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-2026:36018
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:44230
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:44231
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:44259
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:44262
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:44270
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:47727
Reference	added	—	https://access.redhat.com/security/cve/CVE-2026-46323
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=2479832
Reference	added	—	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46323.json
Reference	removed	https://access.redhat.com/errata/RHSA-2026:27708	—
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-2026:36018	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:44230	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:44231	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:44259	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:44262	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:44270	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:47727	—
Reference	removed	https://access.redhat.com/security/cve/CVE-2026-46323	—
Reference	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2479832	—
Reference	removed	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46323.json	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2026:27708 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2026:27731 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2026:27735 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2026:36018 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/security/cve/CVE-2026-46323 Types: Third Party Advisory	—
Reference type	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2479832 Types: Third Party Advisory	—
Reference type	removed	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46323.json Types: Third Party Advisory	—

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

24.08.2026Record modifiedRed Hat ADP

1 individual change: Affected versions (publisher)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9 (+14)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9 (+15)

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

30.07.2026Record modifiedRed Hat ADP

New references:

Show 3 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:44230
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:44231
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9 (+11)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9 (+13)

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

23.07.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:44270

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-2026:44270
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions (+10)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9 (+10)

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

19.06.2026Record modifiedLinux

New references:

https://git.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://git.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d
Affected versions (publisher)	changed	Linux, Linux	Linux, Linux

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

One NVD translation into another language is hidden.

Embed badge

Show the severity and KEV status of this vulnerability on your site – with a link back here. The image is updated hourly.

<a href="https://intel.neosec.eu/en/cve/CVE-2026-46323"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-46323.svg?lang=en" alt="CVE-2026-46323 – NEOSEC Intel" height="20"></a>