SB2026092842 - Incorrect calculation in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) Incorrect calculation (CVE-ID: CVE-2026-98151)

CWE-ID: CWE-682 - Incorrect Calculation

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 trigger a verifier warning.

The vulnerability exists due to inconsistent synchronization of 32-bit register bounds and pointer offset state in the BPF verifier when verifying speculative pointer arithmetic in an unprivileged BPF program. A local user can load a BPF program that performs bounded scalar arithmetic on a map-value pointer to trigger a verifier warning.

The warning occurs when the verifier evaluates a subsequent register copy along a speculative path.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/150aeba624e8b7cac51c39440d7e8e1fd11de9a0
• https://git.kernel.org/stable/c/21a681526c715aebb4f918b8c131583442d1b3d8
• https://git.kernel.org/stable/c/9f9477ae73de9c5a28e8ab7000d8097b078faee4
• https://git.kernel.org/stable/c/d623a4a58bb238443505d5c2949d1182dcfc26b6