SB2026092860 - Improper input validation in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-98132)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause incorrect BPF verifier precision propagation.

The vulnerability exists due to improper verifier state handling in __clean_func_state() in kernel/bpf/states.c when cleaning function state for an 8-byte scalar zero stack spill with a half-dead slot. A local user can trigger the affected stack-state cleanup to cause incorrect BPF verifier precision propagation.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2f3536bff8823d3c5fdbbe15e17bfca696cc2b2e
• https://git.kernel.org/stable/c/436fa689630b741a77ef8c4a6f426479affd5bac