---
id: CVE-2026-80976
title: 'kernel: seg6: reset IP6CB after IPv6 decapsulation (CVE-2026-80976)'
summary: >-
  A flaw was found in the Linux kernel's IPv6 Segment Routing (seg6)
  implementation. An unprivileged user can exploit this vulnerability by
  injecting a specially crafted IPv6 packet. This can lead to an out-of-bounds
  read, potentially causin…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: vendor
cwe: CWE-125
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T18:58:12+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80976.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80976.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80976'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532485'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80976'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80976'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80976.mbox
  - url: 'https://git.kernel.org/stable/c/d1f0d353358987ca87f21d8956e2d2854951130d'
  - url: 'https://git.kernel.org/stable/c/a0e2b0a3718f0cf9fb0ee41710b4a6348a7315c8'
  - url: 'https://git.kernel.org/stable/c/9ae92198c24d7dacd4070e2f34f6e1ed3a63061c'
  - url: 'https://git.kernel.org/stable/c/96c74420ac92930a7e0f21770818544eee4a93d7'
  - url: 'https://git.kernel.org/stable/c/2b154e96fcb3f01fd42765c64e0a56820fbc16eb'
  - url: 'https://git.kernel.org/stable/c/cfa186a0857a0f831dfca67b16bbc40ecfdf3280'
  - url: 'https://git.kernel.org/stable/c/c73fb911e02b9a766c950bc9707f3e3a96ffd702'
  - url: 'https://git.kernel.org/stable/c/f967455fb2a5a2079b9eb5823e9ccf359174bf9f'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00704
epssPercentile: 0.51873
scores:
  vendor: 7
  cna: 9.8
ingestedAt: '2026-09-14T15:23:07.455Z'
---

## Overview

A flaw was found in the Linux kernel's IPv6 Segment Routing (seg6) implementation. An unprivileged user can exploit this vulnerability by injecting a specially crafted IPv6 packet. This can lead to an out-of-bounds read, potentially causing a system crash and resulting in a Denial of Service (DoS).

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80976.json)

**kernel: seg6: reset IP6CB after IPv6 decapsulation** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

Not affected:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat OpenShift Container Platform 4

## Remediation

Affected