SB2026052851 - Improper locking in Linux kernel mm
Published: May 28, 2026
Security Bulletin ID
SB2026052851
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) Improper locking (CVE-ID: CVE-2026-46029)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: 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/E:U/U:Clear
The vulnerability allows a local attacker to cause a denial of service.
The vulnerability exists due to improper lock handling in kmalloc_nolock() when being invoked from nmi context on a uniprocessor kernel. A local attacker can trigger re-entry into the slab allocator to cause a denial of service.
On uniprocessor kernels, spin_trylock() unconditionally succeeds even if the lock is already held, which can corrupt slab state.
Remediation
Install update from vendor's website.