SB20260928146 - Improper Check for Unusual or Exceptional Conditions in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-98058)

CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions

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 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.

Remediation

Install update from vendor's website.

References

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