Out-of-bounds Write Affecting qemu-common package, versions <10:3.1.0-8.amzn2.0.28


Severity

Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.19% (8th percentile)

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  • Snyk IDSNYK-AMZN2-QEMUCOMMON-21695908
  • published25 Oct 2026
  • disclosed18 Sept 2026

Introduced: 18 Sep 2026

CVE-2026-81627  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 qemu-common to version 10:3.1.0-8.amzn2.0.28 or higher.
This issue was patched in ALAS2-2026-4009.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu-common package and not the qemu-common package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

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 Base Scores

version 3.1