SB2026062561 - Improper access control in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) Improper access control (CVE-ID: CVE-2026-53090)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to bypass BPF verifier checks.

The vulnerability exists due to improper access control in the Linux kernel BPF verifier when analyzing ld_{abs,ind} instructions in subprograms. A local user can load a crafted BPF program to bypass BPF verifier checks.

The issue affects subprograms where ld_{abs,ind} instructions are permitted, including cases involving BTF-annotated subprograms with scalar return types.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/d846d83bdacbd8f14fc45c63b8c1d22608452e1c
• https://git.kernel.org/stable/c/ee861486e377edc55361c08dcbceab3f6b6577bd