CVE-2026-81627
Public on 2026-09-18
Modified on 2026-09-18
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.
Severity
See what this means
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 2 - Core | qemu | Pending Fix | ||
| Amazon Linux 2023 | qemu | Pending Fix | ||
| Amazon Linux 2027 Preview | qemu | Not Affected | ||
| Amazon Linux 2 - Core | qemu-guest-agent | Not Affected | ||
| Amazon Linux 2 - Core | qemu-kvm | Not Affected |
CVSS Scores
| Score Type | Score | Vector | |
|---|---|---|---|
| Amazon Linux | CVSSv3 | 6.7 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |