Answer in brief
CVE-2025-11234 records a High severity (CVSS 7.5) vulnerability in Qemu-kvm: vnc websocket handshake use-after-free. The current sources do not mark it as known exploited. The current feed maps Red Hat/openshift/ose-rhel-coreos-9 (generic), qemu (generic), Red Hat/qemu-kvm-ma (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Red Hat/openshift/ose-rhel-coreos-9 (generic), qemu (generic), Red Hat/qemu-kvm-ma (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Red Hat/openshift/ose-rhel-coreos-9generic | * | Not reported |
| qemugeneric | >=2.6.0 <10.1.2 | 10.1.2 |
| Red Hat/qemu-kvm-mageneric | * | Not reported |
Published upstream
Oct 3, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 21, 2026
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.
Quoted source text, attributed separately from HOL analysis.