CVE-2025-11234

Publication date 3 October 2025

Last updated 9 June 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

Description

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.

Status

Package Ubuntu Release Status
qemu 26.10 stonking
Not affected
26.04 LTS resolute
Not affected
25.10 questing
Fixed in 1:10.1.0+ds-5ubuntu2.4
25.04 plucky Ignored end of life, was needed
24.04 LTS noble
Fixed in 1:8.2.2+ds-0ubuntu1.13
22.04 LTS jammy
Fixed in 1:6.2+dfsg-2ubuntu6.28
20.04 LTS focal
Fixed in 1:4.2-3ubuntu6.30+esm1
18.04 LTS bionic
Fixed in 1:2.11+dfsg-1ubuntu7.42+esm5
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
qemu

Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.5 · High

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

Other references

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