SB20260918106 - Improper resource shutdown or release in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) Improper resource shutdown or release (CVE-ID: CVE-2026-93111)

CWE-ID: CWE-404 - Improper Resource Shutdown or Release

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to prevent the release of a tracing_multi link.

The vulnerability exists due to improper resource release in register_fentry_multi() BPF trampoline registration when attaching a tracing_multi link followed by an fentry link. A local user can attach a tracing_multi link and then an fentry link to prevent the release of the tracing_multi link.

The condition triggers a kernel warning during tracing_multi link release.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/280145253fd38fa975cc04963ddaf74c7f415011
• https://git.kernel.org/stable/c/30bdd6d1384d894931f113eb595636092d8e650c