| 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 | 1:10.1.2+ds-1 | 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 |
Notes
[trixie] - qemu <no-dsa> (Minor issue)
[bookworm] - qemu <no-dsa> (Minor issue)
[bullseye] - qemu <no-dsa> (Minor issue)
https://lists.nongnu.org/archive/html/qemu-devel/2025-09/msg06566.html