---
id: CVE-2024-50142
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  xfrm: validate new SA's prefixlen using SA family when sel.family is unset

  This expands the validation introduced in commit 07bf7908950a ("xfrm:
  Validate address prefi…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  xfrm: validate new SA's prefixlen using SA family when sel.family is unset

  This expands the validation introduced in commit 07bf7908950a ("xfrm:
  Validate address prefi…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 2.6.12, < 4.19.323'
  - 'linux_kernel >= 4.20, < 5.4.285'
  - 'linux_kernel >= 5.5, < 5.10.229'
  - 'linux_kernel >= 5.11, < 5.15.170'
  - 'linux_kernel >= 5.16, < 6.1.115'
  - 'linux_kernel >= 6.2, < 6.6.59'
  - 'linux_kernel >= 6.7, < 6.11.6'
  - linux_kernel = 6.12
patched:
  - linux_kernel 6.11.6
published: '2024-11-07'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:19:08.197'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-50142'
references:
  - url: 'https://git.kernel.org/stable/c/2d08a6c31c65f23db71a5385ee9cf9d8f9a67a71'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/401ad99a5ae7180dd9449eac104cb755f442e7f3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7d9868180bd1e4cf37e7c5067362658971162366'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8df5cd51fd70c33aa1776e5cbcd82b0a86649d73'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bce1afaa212ec380bf971614f70909a27882b862'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e68dd80ba498265d2266b12dc3459164f4ff0c4a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f31398570acf0f0804c644006f7bfa9067106b0a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-265688.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00259
epssPercentile: 0.17563
ingestedAt: '2026-10-15T03:30:12.764Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2025-10-01T20:21:04.306564Z'
---

## Overview

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

xfrm: validate new SA's prefixlen using SA family when sel.family is unset

This expands the validation introduced in commit 07bf7908950a ("xfrm:
Validate address prefix lengths in the xfrm selector.")

syzbot created an SA with
    usersa.sel.family = AF_UNSPEC
    usersa.sel.prefixlen_s = 128
    usersa.family = AF_INET

Because of the AF_UNSPEC selector, verify_newsa_info doesn't put
limits on prefixlen_{s,d}. But then copy_from_user_state sets
x->sel.family to usersa.family (AF_INET). Do the same conversion in
verify_newsa_info before validating prefixlen_{s,d}, since that's how
prefixlen is going to be used later on.

## Affected

- `linux_kernel >= 2.6.12, < 4.19.323`
- `linux_kernel >= 4.20, < 5.4.285`
- `linux_kernel >= 5.5, < 5.10.229`
- `linux_kernel >= 5.11, < 5.15.170`
- `linux_kernel >= 5.16, < 6.1.115`
- `linux_kernel >= 6.2, < 6.6.59`
- `linux_kernel >= 6.7, < 6.11.6`
- `linux_kernel = 6.12`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.11.6`