SB20260815295 - Use-after-free in Linux kernel bpf

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Main Vulnerability Database SB20260815295

SB20260815295 - Use-after-free in Linux kernel bpf

Published: August 15, 2026

Security Bulletin ID SB20260815295
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-2026-72427)

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 the cgroup BPF effective program array handling in kernel/bpf/cgroup.c when updating or detaching BPF programs with BPF_F_PREORDER configurations. A local user can trigger incorrect effective array slot selection to cause a denial of service.

The issue occurs because preorder programs are placed at the front of the effective array, so linear traversal of the program list can select the wrong slot.


Remediation

Install update from vendor's website.

References