What is GHSA-x7v7-qcr5-q66r?

GHSA-x7v7-qcr5-q66r is a security advisory published by GitHub Security Advisories with Medium severity. A flaw was found in QEMU. The VAPIC setup hypercall in hw/i386/vapic.c does not validate that the...

Which CVE IDs does GHSA-x7v7-qcr5-q66r cover?

GHSA-x7v7-qcr5-q66r covers the following CVE IDs: CVE-2026-81627. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-x7v7-qcr5-q66r?

GHSA-x7v7-qcr5-q66r has a CVSS v3 base score of 6.7, published by GitHub Security Advisories.

GHSA-x7v7-qcr5-q66rMediumCVSS 6.7

A flaw was found in QEMU. The VAPIC setup hypercall in hw/i386/vapic.c does not validate that the...

Vendor

GitHub Security Advisories

Published

September 18, 2026

Last Modified

September 18, 2026

🔗 CVE IDs covered (1)

CVE-2026-81627 →

📋 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.

🔗 References (5)

https://nvd.nist.gov/vuln/detail/CVE-2026-81627
https://access.redhat.com/security/cve/CVE-2026-81627
https://bugzilla.redhat.com/show_bug.cgi?id=2536950
https://gitlab.com/qemu-project/qemu/-/work_items/4206
https://github.com/advisories/GHSA-x7v7-qcr5-q66r