SB2026091673 - Improper locking in Linux kernel mm
Published: September 16, 2026
Security Bulletin ID
SB2026091673
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper locking (CVE-ID: CVE-2026-90046)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to escalate privileges or cause a kernel crash.
The vulnerability exists due to unsafe locking in the page allocator free path when BPF programs use affected features in NMI on non-SMP builds. A local user can execute BPF programs using these features in NMI to escalate privileges or cause a kernel crash.
Remediation
Install update from vendor's website.