---
id: CVE-2026-80669
title: 'bpf: Disable xfrm_decode_session hook attachment'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Disable xfrm_decode_session hook attachment

  BPF LSM programs can currently attach to xfrm_decode_session(). That
  hook may return an error, but security_skb_classi…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 9e4e01dfd3254c7f04f24b7c6b29596bc12332f3 <
    aa265d47308775c5501073b08133623bcb5421f9
  - >-
    Linux >= 9e4e01dfd3254c7f04f24b7c6b29596bc12332f3 <
    6b44c6660aa1c9b843e450a623ac4a8484919dce
  - >-
    Linux >= 9e4e01dfd3254c7f04f24b7c6b29596bc12332f3 <
    4ae780d173ef40d4f7cb76935dc2d55fbf380009
  - >-
    Linux >= 9e4e01dfd3254c7f04f24b7c6b29596bc12332f3 <
    49fa1be621dde8f526d36e5791aded8fafda1e9c
  - >-
    Linux >= 9e4e01dfd3254c7f04f24b7c6b29596bc12332f3 <
    1bb3b6a5c3c5cc814eae4ff0212fdced36f8bce9
  - >-
    Linux >= 9e4e01dfd3254c7f04f24b7c6b29596bc12332f3 <
    12091470c6b4c1c14b2de12dcbae2ada6cb6d20b
  - Linux 5.7
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T17:02:38.695836Z'
published: '2026-08-28'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T17:05:52.800Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80669'
references:
  - url: 'https://git.kernel.org/stable/c/aa265d47308775c5501073b08133623bcb5421f9'
  - url: 'https://git.kernel.org/stable/c/6b44c6660aa1c9b843e450a623ac4a8484919dce'
  - url: 'https://git.kernel.org/stable/c/4ae780d173ef40d4f7cb76935dc2d55fbf380009'
  - url: 'https://git.kernel.org/stable/c/49fa1be621dde8f526d36e5791aded8fafda1e9c'
  - url: 'https://git.kernel.org/stable/c/1bb3b6a5c3c5cc814eae4ff0212fdced36f8bce9'
  - url: 'https://git.kernel.org/stable/c/12091470c6b4c1c14b2de12dcbae2ada6cb6d20b'
tags:
  - cve.org
epss: 0.00215
epssPercentile: 0.11896
ingestedAt: '2026-11-06T18:00:12.536Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

bpf: Disable xfrm_decode_session hook attachment

BPF LSM programs can currently attach to xfrm_decode_session(). That
hook may return an error, but security_skb_classify_flow() calls it
from a void path and triggers BUG_ON() if an error is returned.

Disable BPF attachment to the hook to prevent a BPF LSM program from
turning packet classification into a full panic.

## Affected

- `Linux >= 9e4e01dfd3254c7f04f24b7c6b29596bc12332f3 < aa265d47308775c5501073b08133623bcb5421f9`
- `Linux >= 9e4e01dfd3254c7f04f24b7c6b29596bc12332f3 < 6b44c6660aa1c9b843e450a623ac4a8484919dce`
- `Linux >= 9e4e01dfd3254c7f04f24b7c6b29596bc12332f3 < 4ae780d173ef40d4f7cb76935dc2d55fbf380009`
- `Linux >= 9e4e01dfd3254c7f04f24b7c6b29596bc12332f3 < 49fa1be621dde8f526d36e5791aded8fafda1e9c`
- `Linux >= 9e4e01dfd3254c7f04f24b7c6b29596bc12332f3 < 1bb3b6a5c3c5cc814eae4ff0212fdced36f8bce9`
- `Linux >= 9e4e01dfd3254c7f04f24b7c6b29596bc12332f3 < 12091470c6b4c1c14b2de12dcbae2ada6cb6d20b`
- `Linux 5.7`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.