---
id: CVE-2026-72242
title: 'selinux: avoid sk_socket dereference in selinux_sctp_bind_connect()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  selinux: avoid sk_socket dereference in selinux_sctp_bind_connect()

  selinux_sctp_bind_connect() dereferences sk->sk_socket to pass a
  struct socket * to selinux_socket_…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= d452930fd3b9031e59abfeddb2fa383f1403d61a <
    e4f3b8db1b0c5e9f6374b8996d9e1888d1042b55
  - >-
    Linux >= d452930fd3b9031e59abfeddb2fa383f1403d61a <
    2fcaf133a8fd88b69f32ebaecad93fd302da828f
  - >-
    Linux >= d452930fd3b9031e59abfeddb2fa383f1403d61a <
    a4bc2fb8536488b37680c0b66c59434a4b7f8c2f
  - >-
    Linux >= d452930fd3b9031e59abfeddb2fa383f1403d61a <
    5d4d93f9bfbc997ffbb03cd6107e8f6979dbb9b4
  - >-
    Linux >= d452930fd3b9031e59abfeddb2fa383f1403d61a <
    cc8bd47b35eca82393cbad08b1cc86f02e034439
  - >-
    Linux >= d452930fd3b9031e59abfeddb2fa383f1403d61a <
    d61a80b17254be7230bc5544f8e62ddf21ab38e2
  - >-
    Linux >= d452930fd3b9031e59abfeddb2fa383f1403d61a <
    37d642b37ccdc31e1947c2ebc8dc38f03d4a0ceb
  - >-
    Linux >= d452930fd3b9031e59abfeddb2fa383f1403d61a <
    56acfeb10019e200ab6787d01f8d7cbe0f01526f
  - Linux 4.17
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T18:44:48.700097Z'
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T18:45:04.443Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-72242'
references:
  - url: 'https://git.kernel.org/stable/c/e4f3b8db1b0c5e9f6374b8996d9e1888d1042b55'
  - url: 'https://git.kernel.org/stable/c/2fcaf133a8fd88b69f32ebaecad93fd302da828f'
  - url: 'https://git.kernel.org/stable/c/a4bc2fb8536488b37680c0b66c59434a4b7f8c2f'
  - url: 'https://git.kernel.org/stable/c/5d4d93f9bfbc997ffbb03cd6107e8f6979dbb9b4'
  - url: 'https://git.kernel.org/stable/c/cc8bd47b35eca82393cbad08b1cc86f02e034439'
  - url: 'https://git.kernel.org/stable/c/d61a80b17254be7230bc5544f8e62ddf21ab38e2'
  - url: 'https://git.kernel.org/stable/c/37d642b37ccdc31e1947c2ebc8dc38f03d4a0ceb'
  - url: 'https://git.kernel.org/stable/c/56acfeb10019e200ab6787d01f8d7cbe0f01526f'
tags:
  - cve.org
epss: 0.00696
epssPercentile: 0.5205
ingestedAt: '2026-10-16T19:46:24.418Z'
---

## Overview

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

selinux: avoid sk_socket dereference in selinux_sctp_bind_connect()

selinux_sctp_bind_connect() dereferences sk->sk_socket to pass a
struct socket * to selinux_socket_bind() and
selinux_socket_connect_helper().  However, when the hook is invoked
from the ASCONF softirq path (sctp_process_asconf), there is no file
reference guaranteeing that sk->sk_socket is non-NULL.  The setsockopt
callers (bindx, connectx, set_primary, sendmsg connect) hold a file
reference and are not affected.

Both selinux_socket_bind() and selinux_socket_connect_helper()
immediately resolve sock->sk, never using the struct socket * for
anything else.  Refactor the inner logic into helpers that take a
struct sock * directly so that selinux_sctp_bind_connect() never needs
to touch sk->sk_socket at all.

## Affected

- `Linux >= d452930fd3b9031e59abfeddb2fa383f1403d61a < e4f3b8db1b0c5e9f6374b8996d9e1888d1042b55`
- `Linux >= d452930fd3b9031e59abfeddb2fa383f1403d61a < 2fcaf133a8fd88b69f32ebaecad93fd302da828f`
- `Linux >= d452930fd3b9031e59abfeddb2fa383f1403d61a < a4bc2fb8536488b37680c0b66c59434a4b7f8c2f`
- `Linux >= d452930fd3b9031e59abfeddb2fa383f1403d61a < 5d4d93f9bfbc997ffbb03cd6107e8f6979dbb9b4`
- `Linux >= d452930fd3b9031e59abfeddb2fa383f1403d61a < cc8bd47b35eca82393cbad08b1cc86f02e034439`
- `Linux >= d452930fd3b9031e59abfeddb2fa383f1403d61a < d61a80b17254be7230bc5544f8e62ddf21ab38e2`
- `Linux >= d452930fd3b9031e59abfeddb2fa383f1403d61a < 37d642b37ccdc31e1947c2ebc8dc38f03d4a0ceb`
- `Linux >= d452930fd3b9031e59abfeddb2fa383f1403d61a < 56acfeb10019e200ab6787d01f8d7cbe0f01526f`
- `Linux 4.17`

## Remediation

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