Use After Free Affecting qemu package, versions <1:11.1.2+ds-1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.38% (30th percentile)

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  • Snyk IDSNYK-DEBIAN14-QEMU-20146829
  • published26 Sept 2026
  • disclosed25 Sept 2026

Introduced: 25 Sep 2026

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

How to fix?

Upgrade Debian:14 qemu to version 1:11.1.2+ds-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu package and not the qemu package as distributed by Debian. See How to fix? for Debian:14 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