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CVE-2026-98716

KVM: SVM: Use the active VMCB's MSR bitmap when checking if MSR is intercepted

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 3.17, 4.5, 6.6.160, 6.12.113, 6.18.56, and 1 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Use the active VMCB's MSR bitmap when checking if MSR is intercepted Use the MSR permission bitmap of the active VMCB instead of assuming that KVM is always using vmcb02's bitmap when L2 is active, as KVM uses msrpm02 if and only if L1 wants to intercept MSR accesses, i.e. if and only if KVM needs to merge msprm01 with msrpm12. Don't bother tracking the virtual address of the bitmap that's being used, as __va() is cheap on x86, and caching the virtual address would introduce yet another source of potentially stale information.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 3.16.57 · fixed in 3.17; From 4.4.168 · fixed in 4.5

  • Linux Linux

    4.16

  • KernelLinux

    From 4.16.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.113; From 6.13.0 · fixed in 6.18.56; From 6.19.0 · fixed in 7.2.10

References 8

git.kernel.org