Improper control of a resource through its lifetime in Linux kernel - CVE-2026-43483
Published: May 14, 2026
Vulnerability identifier: #VU131431
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-2026-43483
CWE-ID: CWE-664
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 state management in the KVM SVM AVIC/CR8 interception logic when activating or deactivating AVIC. A local user can trigger guest operations that lead to a dangling CR8 write intercept to cause a denial of service.
The issue affects SVM and can be fatal to Windows guests when combined with a TPR synchronization bug.
How to mitigate CVE-2026-43483
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/01651e7751edbbc0fb4598f8367a3dabcfc8c182
- https://git.kernel.org/stable/c/737410b32bd615b321da4fbeda490351b9af5e8b
- https://git.kernel.org/stable/c/816fa1dfae4532e851b1fe6b2434c753ecbd86c7
- https://git.kernel.org/stable/c/87d0f901a9bd8ae6be57249c737f20ac0cace93d
- https://git.kernel.org/stable/c/a4123fe5d9122eef9852e4921f7cc463420f30d4
- https://git.kernel.org/stable/c/ba3bca40f9f25c053f69413e5f4a41dd0fd762bf