Improper Check for Unusual or Exceptional Conditions in Linux kernel - CVE-2026-98058

Vulnerability details

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

The vulnerability exists due to improper execution-context validation in the bpf_sys_bpf() and bpf_sys_close() BPF syscall helpers when BPF timer callbacks invoke the helpers. A local user can register a BPF timer callback that invokes either helper to cause a denial of service.

BPF timer callbacks are checked in a non-sleepable context and can run in hrtimer softirq context.

Affected software

How to mitigate CVE-2026-98058

External References

• https://git.kernel.org/stable/c/3408e98f06ce06ea6a58ca6c39da9c23f0029c06
• https://git.kernel.org/stable/c/d05524794240b52fdc3b6c1220dd05505715824d

Related Security Bulletins

• Improper Check for Unusual or Exceptional Conditions in Linux kernel bpf