Riskcovery

CVE-2026-81627

Qemu-kvm: vapic writable rom alias can escape the option-rom window and expose locked smram

State
Published
Severity
8.2 High
Published
Sep 18, 2026
Updated
Oct 30, 2026
Reserved
Aug 27, 2026

Read the record on cve.org

Description

A flaw was found in QEMU. The VAPIC setup hypercall in hw/i386/vapic.c does not validate that the writable RAM alias remains within the option ROM window. A privileged guest user on a Q35/KVM machine can position this alias over locked SMRAM, bypassing chipset D_LCK protection and injecting code into System Management Mode memory.

Scores

CVSSScoreVectorSource
3.18.2 HighCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:Hredhat

Weaknesses

Affected Products

ProductVersions
Red Hat Enterprise Linux 10Red Hat
    Red Hat Enterprise Linux 6Red Hat
      Red Hat Enterprise Linux 7Red Hat
        Red Hat Enterprise Linux 7Red Hat
          Red Hat Enterprise Linux 8Red Hat
            Red Hat Enterprise Linux 8Red Hat
              Red Hat Enterprise Linux 9Red Hat
                Red Hat Enterprise Linux for NVIDIA 26Red Hat
                  Red Hat OpenShift Container Platform 4Red Hat
                    Red Hat OpenShift Container Platform 4Red Hat
                      Red Hat OpenShift Container Platform 5Red Hat
                        Red Hat OpenStack Platform 13 (Queens)Red Hat

                          References

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