Vulnerability details
CVE-2025-11234
Red Hat Enterprise Linux 7
Qemu-kvm: vnc websocket handshake use-after-free
CVSS 3.1
7.5High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.5High | 3.1 | CVEProject cvelistV5 (CNA) (redhat) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 7 | All | CVEProject cvelistV5 (CNA) |
References and advisories
15- https://access.redhat.com/errata/RHSA-2025:23228 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:0326 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:0332 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:0702 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:1831 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:18772 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:22147 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3077 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3165 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:5578 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:59831 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:68513 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:69131 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2025-11234 vdb-entryx_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2401209 issue-trackingx_refsource_REDHAT
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Details
- Published
- 2025-10-03
- Last updated
- 2026-11-05
- State
- Published
- Assigner (CNA)
- redhat
Exploit prediction (EPSS)
0.86%
Probability of exploitation in 30 days
58.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-416Use After Free