Improper locking in Linux kernel - CVE-2026-43285
Published: May 9, 2026
Vulnerability identifier: #VU130894
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-43285
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 locking in mm/slab get_from_any_partial() when handling an NMI context allocation path. A local attacker can trigger an NMI-context slab allocation to cause a denial of service.
The issue arises because current->mems_allowed_seq is accessed through a seqcount_spinlock_t that is not NMI-safe, which can lead to an unsafe locking scenario and deadlock.
How to mitigate CVE-2026-43285
Install security update from vendor's repository.