---
id: CVE-2026-46168
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  mptcp: fix scheduling with atomic in timestamp sockopt

  Using lock_sock_fast() (atomic context) around sock_set_timestamp()
  and sock_set_timestamping() is unsafe, as bo…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  mptcp: fix scheduling with atomic in timestamp sockopt

  Using lock_sock_fast() (atomic context) around sock_set_timestamp()
  and sock_set_timestamping() is unsafe, as bo…
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 >= 5.14, < 5.15.209'
  - 'linux_kernel >= 5.16, < 6.1.175'
  - 'linux_kernel >= 6.2, < 6.6.140'
  - 'linux_kernel >= 6.7, < 6.12.88'
  - 'linux_kernel >= 6.13, < 6.18.30'
  - 'linux_kernel >= 6.19, < 7.0.7'
  - linux_kernel = 7.1
patched:
  - linux_kernel 7.0.7
published: '2026-05-28'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T02:19:47.950'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-46168'
references:
  - url: 'https://git.kernel.org/stable/c/0949d8bbbedbafe0136a1723c41eb823c2f1e09d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7eb513b42721bee4b96da69f6188d5a7783f210d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8a005fe451c73fd2b3d1faa5643c11e6bd07acfc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b157dab93a7af44a84e78cf0cb311dde475cff5b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b5c52908d52c6c8eb8933264aa6087a0600fd892'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e792cfb6aeaf65612cdf8e3ac431d65e66283654'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ebeb70e29e37cfce899309cc2665a3bfe960ed94'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-784472.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00162
epssPercentile: 0.05033
ingestedAt: '2026-10-15T03:30:12.893Z'
---

## Overview

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

mptcp: fix scheduling with atomic in timestamp sockopt

Using lock_sock_fast() (atomic context) around sock_set_timestamp()
and sock_set_timestamping() is unsafe, as both helpers can sleep.

Replace lock_sock_fast() with sleepable lock_sock()/release_sock()
to avoid scheduling while atomic panic.

## Affected

- `linux_kernel >= 5.14, < 5.15.209`
- `linux_kernel >= 5.16, < 6.1.175`
- `linux_kernel >= 6.2, < 6.6.140`
- `linux_kernel >= 6.7, < 6.12.88`
- `linux_kernel >= 6.13, < 6.18.30`
- `linux_kernel >= 6.19, < 7.0.7`
- `linux_kernel = 7.1`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.0.7`