SB20260918351 - Use-after-free in Linux kernel bpf

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Main Vulnerability Database SB20260918351

SB20260918351 - Use-after-free in Linux kernel bpf

Published: September 18, 2026

Security Bulletin ID SB20260918351
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Partial DoS

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-2026-90313)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a local user to trigger an invalid memory access.

The vulnerability exists due to use-after-free in __cgroup_bpf_attach when replacing a cgroup BPF program in multi-attach mode and the attachment fails midway. A local user can perform a failed BPF_F_REPLACE operation and attach another cgroup BPF program to trigger an invalid memory access.

The issue requires an active replaced program with local storage to execute bpf_get_local_storage after the failed attachment.


Remediation

Install update from vendor's website.

References