CVE-2026-81627
CVE-2026-81627: 1 tracked advisory record across Red Hat. Compare vendor sources and published fix guidance.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
Vendor advisory comparison
Red Hat
1 advisory- Advisory severityHigh8.2
High [CVE-2026-81627] Qemu-kvm: vapic writable rom alias can escape the option-rom window and expose locked smram
CVE-2026-81627Source published Source updated
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. This flaw allows a privileged guest to bypass SMRAM locking on Q35 machine types by placing the VAPIC writable ROM alias outside the option-ROM window. While the kvmvapic TPR optimization is normally used only by 32-bit Windows guests, any privileged guest can deliberately invoke the VAPIC setup hypercall to trigger the vulnerable code path. Exploitation requires guest root access and KVM acceleration. Red Hat severity: Important — CVSS 8.2…
- Affected products in this advisory
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
4 more entries in the full advisory.
- Source-reported affected versions
- Affected-version details not available in this record.
- Source-reported fixed versions
- No fixed-version detail extracted. This does not mean no fix exists.
- Mitigation guidance
- The VAPIC TPR optimization can be disabled by preventing the kvmvapic option ROM from loading. When using libvirt, set the following in the guest's domain XML: ``` <features> <apic/> <hyperv> <vapic state='off'/> </hyperv> </features> ``` When using QEMU directly, pass `-global kvmvapic.rom=off` on the command line. This optimization is only used by 32-bit Windows guests for MMIO-based TPR register access. Linux guests, 64-bit Windows guests, and any guest using x2APIC or MSR-based TPR access are unaffected by disabling it.
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