SB20260815201 - Improper access control in Linux kernel handshake

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Main Vulnerability Database SB20260815201

SB20260815201 - Improper access control in Linux kernel handshake

Published: August 15, 2026

Security Bulletin ID SB20260815201
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper access control (CVE-ID: CVE-2026-74270)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to spoof handshake completion or disrupt an in-flight handshake.

The vulnerability exists due to improper access control in handshake_nl_done_doit() and the handshake genl DONE command when submitting a DONE request for a supplied sockfd without sender authentication. A local user can send a forged DONE message with a chosen status value to spoof handshake success or tear down a legitimate handshake.

The issue affects the DONE downcall of the handshake generic netlink family, where fd lookup confirms only that a pending handshake request exists for the supplied sockfd.


Remediation

Install update from vendor's website.

References