CriticalCVE-2026-46244

Linux Kernel: security vulnerability (CVE-2026-46244)

Published 03.06.2026Last modified 19.10.2026Sources: Ubuntu, Red Hat, SUSE, Debian, Msrc Update Guide, CVE.org, BSI

What is affected, what to do

Update Linux Kernel to version 6.6.142, Linux Kernel to version 6.12.92, Linux Kernel to version 6.18.34.

Affected: 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 6.6.142
Linux Kernel 6.12.92
Linux Kernel 6.18.34
Linux Kernel 7.0.11
Linux Kernel 7.1

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Metrics

9.1

Priority

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

Source: Vendor (CNA), CVSS v3

9.1

CVSS v3

Severity Critical on the scale from 0 to 10.

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

0.4 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 36.0

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: 74.20 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: 9.1 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: 9.1
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: 0.4 %; 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: 36.0; Elevated — this CVE ranks above at least 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: 03.06.2026
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-682

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 netfilter subsystem, specifically within the nft_inner module. This vulnerability arises from an incorrect handling of IPv6 inner packet processing, where the transport header offset (inner_thoff) becomes desynchronized from the Layer 4 protocol (l4proto). A remote attacker could exploit this desynchronization to perform transport header forgery, potentially leading to a firewall bypass and allowing unauthorized network access.

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

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` `6.13 – < 6.18.34` `—` `6.7 – < 6.12.92` `6.2 – < 6.6.142`	`7.0.11` `6.18.34` `7.1` `6.12.92` `6.6.142`

Vendors and products

Affected operating systems

Affected operating systems

Linux	debian	linux	`trixie`
Linux	linux	linux_kernel	`7.1`
Linux	linux	linux_kernel	—

Weakness classes (CWE)

CWE-682Incorrect Calculation
Pillar
The product performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management.
Entry at MITRE CWE-682

References & sources

git.kernel.orgstable/c/c161ad9157f5a0429b5ff94d9770faf3bf48d273Patch
git.kernel.orgstable/c/870d59e2cf218e7418491e26bad768cb16654582Patch
git.kernel.orgstable/c/689bbf48c1f45130086ae1c46ab83ea4c753c601Patch
git.kernel.orgstable/c/d0f98a3617f6ae5b1e95cde1e68e7ead4a1279cePatch
git.kernel.orgstable/c/b6a91f68ebfed9c38e0e9150f58a9b85da07181cPatch
access.redhat.comsecurity/cve/CVE-2026-46244Vulnerability database, x_refsource_REDHAT
bugzilla.redhat.comRHBZ#2484451Issue tracking, x_refsource_REDHAT
security.access.redhat.comdata/csaf/v2/vex/2026/cve-2026-46244.jsonx_sadp-csaf-vex
access.redhat.comerrata/RHSA-2026:33215Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:34911Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:34443Vendor 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-2026:55618Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:55763Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:56225Vendor 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-682
Show the original change
Individual changes of this event as published by NVD
Type Action Before After
Weakness type (CWE) added
—
CWE-682
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-682

16.10.2026Record modifiedLinux

New references:

and 1 more reference

Show 15 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://git.kernel.org/stable/c/689bbf48c1f45130086ae1c46ab83ea4c753c601
Reference	added	—	https://git.kernel.org/stable/c/870d59e2cf218e7418491e26bad768cb16654582
Reference	added	—	https://git.kernel.org/stable/c/b6a91f68ebfed9c38e0e9150f58a9b85da07181c
Reference	added	—	https://git.kernel.org/stable/c/c161ad9157f5a0429b5ff94d9770faf3bf48d273
Reference	added	—	https://git.kernel.org/stable/c/d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce
Reference	removed	https://git.kernel.org/stable/c/689bbf48c1f45130086ae1c46ab83ea4c753c601	—
Reference	removed	https://git.kernel.org/stable/c/870d59e2cf218e7418491e26bad768cb16654582	—
Reference	removed	https://git.kernel.org/stable/c/b6a91f68ebfed9c38e0e9150f58a9b85da07181c	—
Reference	removed	https://git.kernel.org/stable/c/c161ad9157f5a0429b5ff94d9770faf3bf48d273	—
Reference	removed	https://git.kernel.org/stable/c/d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce	—
Reference type	removed	https://git.kernel.org/stable/c/689bbf48c1f45130086ae1c46ab83ea4c753c601 Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/870d59e2cf218e7418491e26bad768cb16654582 Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/b6a91f68ebfed9c38e0e9150f58a9b85da07181c Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/c161ad9157f5a0429b5ff94d9770faf3bf48d273 Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce Types: Patch	—

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

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-2026-46244","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:21:20.717778Z"}

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

16.10.2026Record modifiedRed Hat ADP

New references:

and 7 more references

Show 22 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:33215
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:34094
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:34443
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:34911
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36018
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:55618
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:55763
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:56225
Reference	added	—	https://access.redhat.com/security/cve/CVE-2026-46244
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=2484451
Reference	added	—	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46244.json
Reference	removed	https://access.redhat.com/errata/RHSA-2026:33215	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:34094	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:34443	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:34911	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36018	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:55618	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:55763	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:56225	—
Reference	removed	https://access.redhat.com/security/cve/CVE-2026-46244	—
Reference	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2484451	—
Reference	removed	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46244.json	—

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

19.08.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:56225

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-2026:56225
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+10)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+11)

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

Show 2 older changes

18.08.2026Record 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-2026:55618
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:55763
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9 (+8)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+10)

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

03.07.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:34911

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-2026:34911
Affected versions (publisher)	changed	Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux AppStream EUS (v.9.6) (+16)	Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream E4S (v.9.4) (+20)

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

One NVD translation into another language is hidden.

Linked advisories

@RISK®: The Consensus Security Vulnerability Alert: Vol. 26, Num. 25SANS @RISK25.06.2026

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