SB2026091870 - Improper access control in Linux kernel bpf
Published: September 18, 2026
Security Bulletin ID
SB2026091870
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper access control (CVE-ID: CVE-2026-93144)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to bypass read-only restrictions on untrusted BTF pointers.
The vulnerability exists due to improper access control in check_ptr_to_btf_access() in the BPF verifier when validating write accesses through untrusted BTF pointers. A local user can load a BPF program that performs a write through an untrusted BTF pointer to bypass read-only restrictions on untrusted BTF pointers.
Remediation
Install update from vendor's website.