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Vulnerability record · CVE-2026-81627 · published 18 September 2026

CVE-2026-81627: Out-of-bounds write vulnerability

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.

8.2 CVSS 3.1 High EPSS 0.19% · top 92.1% CWE-787 · Out-of-bounds write Awaiting Analysis
8.2CVSS 3.1 base score
0.19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
21 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

References

LinkTags
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://gitlab.com/qemu-project/qemu/-/work_items/4206

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Source: NIST National Vulnerability Database (record CVE-2026-81627), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.