VULNERABILITY INTELLIGENCE

CVE-2026-43133

CVSS score7.9 HIGH
EPSS probability0.13%
CISA KEVNot currently listed
Published2026-05-06
Last modified2026-10-19
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation Commit cc3ed80ae69f ("KVM: nSVM: always use vmcb01 to for vmsave/vmload of guest state") made KVM always use vmcb01 for the fields controlled by VMSAVE/VMLOAD, but it missed updating the VMLOAD/VMSAVE emulation code to always use vmcb01. As a result, if VMSAVE/VMLOAD is executed by an L2 guest and is not intercepted by L1, KVM will mistakenly use vmcb02. Always use vmcb01 instead of the current VMCB.

Weakness classification

  • CWE-628: Function Call with Incorrectly Specified Arguments
  • CWE-754: Improper Check for Unusual or Exceptional Conditions

Primary references