---
id: CVE-2025-38112
title: 'net: Fix TOCTOU issue in sk_is_readable()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: Fix TOCTOU issue in sk_is_readable()

  sk->sk_prot->sock_is_readable is a valid function pointer when sk resides
  in a sockmap. After the last sk_psock_put() (which …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 8934ce2fd08171e8605f7fada91ee7619fe17ab8 <
    c2b26638476baee154920bb587fc94ff1bf04336
  - >-
    Linux >= 8934ce2fd08171e8605f7fada91ee7619fe17ab8 <
    6fa68d7eab34d448a61aa24ea31e68b3231ed20d
  - >-
    Linux >= 8934ce2fd08171e8605f7fada91ee7619fe17ab8 <
    8926a7ef1977a832dd6bf702f1a99303dbf15b15
  - >-
    Linux >= 8934ce2fd08171e8605f7fada91ee7619fe17ab8 <
    ff55c85a923e043d59d26b20a673a1b4a219c310
  - >-
    Linux >= 8934ce2fd08171e8605f7fada91ee7619fe17ab8 <
    1e0de7582ceccbdbb227d4e0ddf65732f92526da
  - >-
    Linux >= 8934ce2fd08171e8605f7fada91ee7619fe17ab8 <
    1b367ba2f94251822577daed031d6b9a9e11ba91
  - >-
    Linux >= 8934ce2fd08171e8605f7fada91ee7619fe17ab8 <
    2660a544fdc0940bba15f70508a46cf9a6491230
  - Linux 4.17
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:49:48.418942Z'
published: '2025-07-03'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:52:16.103Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-38112'
references:
  - url: 'https://git.kernel.org/stable/c/c2b26638476baee154920bb587fc94ff1bf04336'
  - url: 'https://git.kernel.org/stable/c/6fa68d7eab34d448a61aa24ea31e68b3231ed20d'
  - url: 'https://git.kernel.org/stable/c/8926a7ef1977a832dd6bf702f1a99303dbf15b15'
  - url: 'https://git.kernel.org/stable/c/ff55c85a923e043d59d26b20a673a1b4a219c310'
  - url: 'https://git.kernel.org/stable/c/1e0de7582ceccbdbb227d4e0ddf65732f92526da'
  - url: 'https://git.kernel.org/stable/c/1b367ba2f94251822577daed031d6b9a9e11ba91'
  - url: 'https://git.kernel.org/stable/c/2660a544fdc0940bba15f70508a46cf9a6491230'
tags:
  - cve.org
epss: 0.00148
epssPercentile: 0.04065
ingestedAt: '2026-11-05T22:38:31.931Z'
---

## Overview

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

net: Fix TOCTOU issue in sk_is_readable()

sk->sk_prot->sock_is_readable is a valid function pointer when sk resides
in a sockmap. After the last sk_psock_put() (which usually happens when
socket is removed from sockmap), sk->sk_prot gets restored and
sk->sk_prot->sock_is_readable becomes NULL.

This makes sk_is_readable() racy, if the value of sk->sk_prot is reloaded
after the initial check. Which in turn may lead to a null pointer
dereference.

Ensure the function pointer does not turn NULL after the check.

## Affected

- `Linux >= 8934ce2fd08171e8605f7fada91ee7619fe17ab8 < c2b26638476baee154920bb587fc94ff1bf04336`
- `Linux >= 8934ce2fd08171e8605f7fada91ee7619fe17ab8 < 6fa68d7eab34d448a61aa24ea31e68b3231ed20d`
- `Linux >= 8934ce2fd08171e8605f7fada91ee7619fe17ab8 < 8926a7ef1977a832dd6bf702f1a99303dbf15b15`
- `Linux >= 8934ce2fd08171e8605f7fada91ee7619fe17ab8 < ff55c85a923e043d59d26b20a673a1b4a219c310`
- `Linux >= 8934ce2fd08171e8605f7fada91ee7619fe17ab8 < 1e0de7582ceccbdbb227d4e0ddf65732f92526da`
- `Linux >= 8934ce2fd08171e8605f7fada91ee7619fe17ab8 < 1b367ba2f94251822577daed031d6b9a9e11ba91`
- `Linux >= 8934ce2fd08171e8605f7fada91ee7619fe17ab8 < 2660a544fdc0940bba15f70508a46cf9a6491230`
- `Linux 4.17`

## Remediation

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