SB2026100412 - Incorrect calculation in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) Incorrect calculation (CVE-ID: CVE-2026-98042)

CWE-ID: CWE-682 - Incorrect Calculation

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/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 register-range tracking.

The vulnerability exists due to improper handling of scalar IDs in the BPF verifier check_cond_jmp_op() function when processing conditional jumps involving linked scalar registers. A local user can submit a BPF program with many linked registers to cause incorrect BPF verifier register-range tracking.

Linked-register groups that exceed the verifier tracking limit are required.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/73a98f96811e2cb0f4210b1caa8cb322f92f2a2b
• https://git.kernel.org/stable/c/e821ff19b8ef08255ff8d8234774ed814637e9bf