SB20260928179 - Always-Incorrect Control Flow Implementation in Linux kernel bpf progs

Description

This security bulletin contains information about 1 vulnerability.

1) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-98019)

CWE-ID: CWE-670 - Always-Incorrect Control Flow Implementation

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 cause incorrect BPF verifier state pruning.

The vulnerability exists due to failure to mark scalar registers precise in the BPF verifier's check_func_arg() and check_helper_call() functions when handling nullable function arguments or zero bpf_get_local_storage() flags. A local user can submit BPF code that triggers the affected verification paths to cause incorrect BPF verifier state pruning.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/1a3a10b030c96ea88868ccc060a16827c01eaa5a
• https://git.kernel.org/stable/c/69a9ad004ccf5d45e534c7d503f47f643abe64b7