CVE-2025-11234

Name	CVE-2025-11234
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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1117153

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
qemu (PTS)	bullseye	1:5.2+dfsg-11+deb11u3	vulnerable
	bullseye (security)	1:5.2+dfsg-11+deb11u5	vulnerable
	bookworm	1:7.2+dfsg-7+deb12u16	vulnerable
	bookworm (security)	1:7.2+dfsg-7+deb12u15	vulnerable
	trixie	1:10.0.3+ds-0+deb13u1	vulnerable
	trixie (security)	1:10.0.2+ds-2+deb13u1	vulnerable
	forky, sid	1:10.1.0+ds-5	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
qemu	source	(unstable)	(unfixed)			1117153

https://lists.nongnu.org/archive/html/qemu-devel/2025-09/msg06566.html