CVE-2025-11234Qemu-kvm: vnc websocket handshake use-after-free
Updated under an hour ago ()
Does this affect you?
It affects Red Hat Enterprise Linux 10 and 6 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-416
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Deferred
- Record last updated
- Oct 9, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 18:10.0.0-14.el10_1.5 not affected | CNA record |
from 8040020260916092751.522a0ee4 not affected | CNA record | |
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support redhat:rhel_eus_long_life | from 8040020260916092751.522a0ee4 not affected | CNA record |
from 8080020260910092120.63b34585 not affected | CNA record | |
from 8080020260910092120.63b34585 not affected | CNA record | |
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support redhat:rhel_eus | from 17:8.2.0-11.el9_4.18 not affected | CNA record |
Red Hat Red Hat OpenShift Container Platform 4.12 redhat:openshift | from 412.86.202608241157-0 not affected | CNA record |
References
- https://access.redhat.com/errata/RHSA-2025:23228vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:0326vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:0332vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:0702vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:1831vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:18772vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:22147vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:3077vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:3165vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:5578vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:59831vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:68513vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:69131vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2025-11234vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2401209issue-tracking, x-refsource-redhat
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.