SB20260827135 - Out-of-bounds read in Linux kernel sched

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Main Vulnerability Database SB20260827135

SB20260827135 - Out-of-bounds read in Linux kernel sched

Published: August 27, 2026

Security Bulletin ID SB20260827135
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds read (CVE-ID: CVE-2026-74739)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in u32_bind_class() when processing cls_u32 walker callback entries. A local user can trigger class binding on a hash table entry that is incorrectly treated as a tc_u_knode to disclose sensitive information.

The issue occurs because u32_walk() can enumerate both tc_u_hnode and tc_u_knode objects, but the affected code unconditionally treats the callback argument as a tc_u_knode.


Remediation

Install update from vendor's website.

References