Improper locking in Linux kernel - CVE-2026-46029
Published: May 28, 2026
Vulnerability identifier: #VU132464
CSH Severity: Low
CVSS v4.0: 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
CVE-ID: CVE-2026-46029
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-46029
Install security update from vendor's repository.