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7.5 High

CVE-2025-11234 Qemu-kvm: vnc websocket handshake use-after-free

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 3.1 detail

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitable remotely over the network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector
Network
Attack complexity
Low
Privileges required
None
Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Affected products and versions

Product Affected versions Fixed in
Red Hat Enterprise Linux 9.4 Extended Update Support Versions not published
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 6 Versions not published
Red Hat Enterprise Linux 7 Versions not published
Red Hat Enterprise Linux 8 8100020251202222937.489197 earliest → < 8100020251202222937.489197e6 8100020251202222937.489197e6
Red Hat Enterprise Linux 9 Versions not published
Red Hat OpenShift Container Platform 4 Versions not published
Red Hat OpenShift Container Platform 4.16 416.94 earliest → < 416.94.202601071926-0 416.94.202601071926-0
Red Hat OpenShift Container Platform 4.18 418.94 earliest → < 418.94.202601071817-0 418.94.202601071817-0
Show the 8 other branches
Product Affected versions Fixed in
Red Hat OpenShift Container Platform 4.17 417.94 earliest → < 417.94.202601120213-0 417.94.202601120213-0
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Versions not published
Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Versions not published
Red Hat OpenShift Container Platform 4.12 412.86 earliest → < 412.86.202608241157-0 412.86.202608241157-0
Red Hat Enterprise Linux 8.8 Telecommunications Update Service 8080020260910092120.63 earliest → < 8080020260910092120.63b34585 8080020260910092120.63b34585
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 8080020260910092120.63 earliest → < 8080020260910092120.63b34585 8080020260910092120.63b34585
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 8040020260916092751.522 earliest → < 8040020260916092751.522a0ee4 8040020260916092751.522a0ee4
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 8040020260916092751.522 earliest → < 8040020260916092751.522a0ee4 8040020260916092751.522a0ee4

References

Timeline

  1. Published
  2. Last modified

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