CVE-2026-98714
kernel: KVM: SVM: Update control fields on #VMEXIT if and only if VMRUN succeeded
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 18, 2026
Updated · October 23, 2026
Description
A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem for AMD processors (SVM). When virtual machine execution fails, the hypervisor prematurely updates control fields and marks control blocks as clean, assuming hardware operations were performed. A local attacker could leverage this behavior to cause state desynchronization between KVM and the processor, leading to system instability or unexpected guest behavior.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.6CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
CWE-252 · Unchecked Return Value