SB2026091878 - Always-Incorrect Control Flow Implementation in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-93135)

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

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/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 helper-call offset handling in bpf_do_misc_fixups() when the BPF interpreter executes a program whose helper calls were expected to be inlined by JIT compilation. A local user can execute a BPF program containing such helper calls to cause a denial of service.

JIT compilation must be unavailable at runtime, such as when it is disabled or when dynamic JIT compilation fails.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/21c6445366795fa3a89954e1d318e7c8afdef843
• https://git.kernel.org/stable/c/f1c27922576edccb99d0257827d09bd05c0304a6