CVE-2026-81627

Published: Sep 18, 2026Modified: Sep 21, 2026

8.2

Vector

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

Exploitability: 1.5 / Impact: 6.0

Source: secalert@redhat.com

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.

Related CWEs

CWE-787

Out-of-bounds Write

The product writes data past the end, or before the beginning, of the intended buffer.

References (4)

https://access.redhat.com/security/cve/CVE-2026-81627

Source: secalert@redhat.com

https://bugzilla.redhat.com/show_bug.cgi?id=2536950

Source: secalert@redhat.com

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

Source: secalert@redhat.com

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

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Timeline

No history available yet.