SB20260918233 - Race condition in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-92485)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to cause a kernel warning.

The vulnerability exists due to improper synchronization and flag handling in the BPF trampoline flag management logic when attaching multiple fexit programs targeting a tail-call-reachable BPF program. A local privileged user can attach fexit programs and close an attached fexit link to cause a kernel warning.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/48a0209d8da0d90a7b0a0db19d1ff88027b13781
• https://git.kernel.org/stable/c/61aaa8782bec59ecffd22e030f54ef9351bcabf9