Use After Free Affecting qemu-guest-agent package, versions <17:7.2.0-14.el9_2.24


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.78% (52nd 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-RHEL9-QEMUGUESTAGENT-15511397
  • published13 Mar 2026
  • disclosed30 Sept 2025

Introduced: 30 Sep 2025

CVE-2025-11234  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade RHEL:9 qemu-guest-agent to version 17:7.2.0-14.el9_2.24 or higher.
This issue was patched in RHSA-2026:3077.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu-guest-agent package and not the qemu-guest-agent package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

A flaw was found in QEMU. If the QIOChannelWebsock object is freed while it is waiting to complete a handshake, a GSource is leaked. This can lead to the callback firing later on and triggering a use-after-free in the use of the channel. This can be abused by a malicious client with network access to the VNC WebSocket port to cause a denial of service during the WebSocket handshake prior to the VNC client authentication.

CVSS Base Scores

version 3.1