CVE-2025-11234
Qemu-kvm: vnc websocket handshake use-after-free
7.5CVSSHIGH
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 Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:LAttack ComplexityLow
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:UScopeUnchanged
Impact
C:NConfidentialityNone
I:NIntegrityNone
A:HAvailabilityHigh
Weaknesses
Affected Products
and 9 more affected products View all →
Attack Graph
Products CVE Techniques Tactics
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Exploitability
Official Patch Available
MITRE ATT&CK
2 techniques Initial Access
Privilege Escalation
References
https://lists.nongnu.org/archive/html/qemu-devel/2025-09/msg06566.html
lists.nongnu.org
https://wiki.astralinux.ru/astra-linux-se17-bulletin-2025-1202SE17
wiki.astralinux.ru
https://wiki.astralinux.ru/astra-linux-se47-bulletin-2025-1216SE47
wiki.astralinux.ru
and 13 more references View all →
Timeline
Published
Oct 3, 2025
Last Updated
Jun 1, 2026
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