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CVE-2025-11234 (GCVE-0-2025-11234)

Vulnerability from cvelistv5 – Published: 2025-10-03 10:30 – Updated: 2026-09-17 07:27
VLAI
Title
Qemu-kvm: vnc websocket handshake use-after-free
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-03 15:56 UTC
CWE
Assigner
References
URL Tags
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/security/cve/CVE-2025-11234 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2401209 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version CPE status
Affected: 2.6.0 , < 10.1.2 (semver)
Red Hat Red Hat Enterprise Linux 10 Unaffected: 18:10.0.0-14.el10_1.5 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.1
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8 Unaffected: 8100020251120003312.489197e6 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/a:redhat:enterprise_linux:8::crb
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8 Unaffected: 8100020251202222937.489197e6 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/a:redhat:enterprise_linux:8::crb
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 8080020260910092120.63b34585 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8::appstream
    cpe:/a:redhat:rhel_tus:8.8::appstream
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 8080020260910092120.63b34585 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8::appstream
    cpe:/a:redhat:rhel_tus:8.8::appstream
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9 Unaffected: 17:10.1.0-17.el9_8 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Unaffected: 17:6.2.0-11.el9_0.10 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.0::appstream
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 17:7.2.0-14.el9_2.24 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2::appstream
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support Unaffected: 17:8.2.0-11.el9_4.18 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.4::appstream
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support Unaffected: 17:8.2.0-11.el9_4.19 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.4::appstream
Create a notification for this product.
Red Hat Red Hat OpenShift Container Platform 4.12 Unaffected: 412.86.202608241157-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.12::el8
Create a notification for this product.
Red Hat Red Hat OpenShift Container Platform 4.16 Unaffected: 416.94.202601071926-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.16::el9
Create a notification for this product.
Red Hat Red Hat OpenShift Container Platform 4.17 Unaffected: 417.94.202601120213-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.17::el9
Create a notification for this product.
Red Hat Red Hat OpenShift Container Platform 4.18 Unaffected: 418.94.202601071817-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.18::el9
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
Create a notification for this product.
Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
Create a notification for this product.
Date Public
2025-09-30 12:18
Credits
Red Hat would like to thank Grant Millar (Cylo) for reporting this issue.
Show details on NVD website
To clipboard 

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}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.