EUVD-2026-82872
GHSA-x7v7-qcr5-q66r
Severity by source
AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Local privileged guest user (AV:L/PR:H) with no interaction; SMM code injection yields full C:H/I:H/A:H; S:U retained per vendor though the firmware-boundary crossing arguably supports S:C.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Privileged users inside a guest running on a Q35/KVM QEMU virtual machine can abuse the VAPIC setup hypercall in hw/i386/vapic.c to position a writable RAM alias over locked SMRAM, bypassing the Q35 chipset's D_LCK protection and injecting code into System Management Mode memory - the highest-privilege execution context on the platform. The flaw is an out-of-bounds write (CWE-787) scored 6.7 under CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H: it is local to the guest, requires an already root-equivalent account there, and does not affect non-Q35 machine types or non-KVM configurations, which substantially narrows realistic exposure. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a QEMU virtual machine using the Q35 machine type with KVM acceleration, and the attacker must already be a privileged (root-equivalent) user inside the guest able to issue the VAPIC setup hypercall. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 3.1 vector (AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H, base 6.7) is internally consistent with the description: exploitation requires a privileged guest user (PR:H) operating locally within the guest (AV:L) against a Q35/KVM QEMU machine, and the payoff is full compromise of System Management Mode memory (C:H/I:H/A:H). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch was identified in the available data at time of analysis; remediation should therefore be driven by tracking the Red Hat advisory (https://access.redhat.com/security/cve/CVE-2026-81627), the associated Bugzilla record (https://bugzilla.redhat.com/show_bug.cgi?id=2536950) and the upstream QEMU work item (https://gitlab.com/qemu-project/qemu/-/work_items/4206) for patched qemu-kvm builds, and by applying them as soon as Red Hat ships updated packages. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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