SB20260812152 - Use-after-free in Linux kernel sched

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Main Vulnerability Database SB20260812152

SB20260812152 - Use-after-free in Linux kernel sched

Published: August 12, 2026

Security Bulletin ID SB20260812152
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-68377)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a use-after-free in tunnel_key_release_params() in net/sched/act_tunnel_key.c when handling concurrent tunnel key action processing on the datapath. A local user can trigger a race condition to cause a denial of service.

The issue arises because a reader may still access the old params structure under RCU while the associated metadata_dst is released synchronously.


Remediation

Install update from vendor's website.

References