SB2026091830 - Incorrect behavior order in Linux kernel bpf
Published: September 18, 2026
Security Bulletin ID
SB2026091830
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Incorrect behavior order (CVE-ID: CVE-2026-93173)
CWE-ID: CWE-696 - Incorrect Behavior Order
CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to cause a denial of service.
The vulnerability exists due to improper execution-context handling in the bpf_prog_free hook of sleepable_lsm_hooks when a BPF program is freed while a sleepable LSM program is attached. A local privileged user can cause a BPF program to be freed to cause a denial of service.
Remediation
Install update from vendor's website.