Improper locking in Linux kernel - CVE-2026-31592
Published: April 25, 2026
Vulnerability identifier: #VU127806
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-2026-31592
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 user to cause a denial of service.
The vulnerability exists due to improper locking in sev_mem_enc_register_region() when handling KVM ioctls during SEV guest initialization failure paths. A local user can issue crafted ioctl calls to trigger a general protection fault and kernel crash.
The issue can occur if KVM_SEV_INIT{2} fails and KVM attempts to add to an uninitialized sev->regions_list.
How to mitigate CVE-2026-31592
Install security update from vendor's repository.