Use After Free Affecting qemu-system-x86-core package, versions <10:3.1.0-8.amzn2.0.29


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.41% (35th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-AMZN2-QEMUSYSTEMX86CORE-21696686
  • published25 Oct 2026
  • disclosed25 Sept 2026

Introduced: 25 Sep 2026

CVE-2026-93834  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 qemu-system-x86-core to version 10:3.1.0-8.amzn2.0.29 or higher.
This issue was patched in ALAS2-2026-4027.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu-system-x86-core package and not the qemu-system-x86-core package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

A use-after-free vulnerability was found in QEMU's 9pfs subsystem. A race condition between the main thread and a worker thread when processing concurrent Tlcreate and Twalk requests allows a malicious guest user to craft a fid path containing stale heap data, bypassing directory traversal restrictions and escaping the shared directory boundary. This can lead to arbitrary host file read/write and code execution (VM escape) as the QEMU process user.

CVSS Base Scores

version 3.1