Riskcovery

CVE-2025-11234

Qemu-kvm: vnc websocket handshake use-after-free

State
Published
Severity
7.5 High
Published
Oct 3, 2025
Updated
Oct 9, 2026
Reserved
Oct 1, 2025

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hredhat

Weaknesses

Affected Products

ProductVersions
qemu
  • 2.6.0 to before 10.1.2Affected
Red Hat Enterprise Linux 10Red Hat
  • 18:10.0.0-14.el10_1.5 and laterNot affected
Red Hat Enterprise Linux 8Red Hat
  • 8100020251120003312.489197e6 and laterNot affected
Red Hat Enterprise Linux 8Red Hat
  • 8100020251202222937.489197e6 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat
  • 8040020260916092751.522a0ee4 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat
  • 8040020260916092751.522a0ee4 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat
  • 8080020260910092120.63b34585 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat
  • 8080020260910092120.63b34585 and laterNot affected
Red Hat Enterprise Linux 9Red Hat
  • 17:10.1.0-17.el9_8 and laterNot affected
Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRed Hat
  • 17:6.2.0-11.el9_0.10 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat
  • 17:7.2.0-14.el9_2.24 and laterNot affected
Red Hat Enterprise Linux 9.4 Extended Update SupportRed Hat
  • 17:8.2.0-11.el9_4.18 and laterNot affected
Red Hat Enterprise Linux 9.4 Extended Update SupportRed Hat
  • 17:8.2.0-11.el9_4.19 and laterNot affected
Red Hat OpenShift Container Platform 4.12Red Hat
  • 412.86.202608241157-0 and laterNot affected
Red Hat OpenShift Container Platform 4.16Red Hat
  • 416.94.202601071926-0 and laterNot affected
Red Hat OpenShift Container Platform 4.17Red Hat
  • 417.94.202601120213-0 and laterNot affected
Red Hat OpenShift Container Platform 4.18Red Hat
  • 418.94.202601071817-0 and laterNot affected
Red Hat Enterprise Linux 6Red Hat
    Red Hat Enterprise Linux 7Red Hat
      Red Hat Enterprise Linux 7Red Hat

        References

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