Improper control of a resource through its lifetime in Linux kernel - CVE-2026-89931
Published: September 17, 2026
Vulnerability identifier: #VU150354
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89931
CWE-ID: CWE-664
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause vmcs12 pages to be double-mapped.
The vulnerability exists due to improper state management in KVM nVMX nested VM-Exit handling when emulating a nested VM-Exit. A local user can trigger a nested VM-Exit without the pending request being cleared to cause vmcs12 pages to be double-mapped.
The condition can occur if KVM exits VM-Enter without processing the request before emulating VMLAUNCH or VMRESUME.
Affected software
Linux kernel
How to mitigate CVE-2026-89931
Install security update from vendor's repository.