Use After Free Affecting qemu-img-debuginfo package, versions <2:11.0.0-4.amzn2023


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.41% (35th percentile)

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  • Snyk IDSNYK-AMZN2023-QEMUIMGDEBUGINFO-21701064
  • 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:2023 qemu-img-debuginfo to version 2:11.0.0-4.amzn2023 or higher.
This issue was patched in ALAS2023-2026-3241.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu-img-debuginfo package and not the qemu-img-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 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