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

Vulnerability from cvelistv5 – Published: 2025-10-03 10:30 – Updated: 2026-06-01 03:03
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 (v2.0.3)
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/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
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 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 4.16 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.
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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\"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/security/cve/CVE-2025-11234\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2401209\", \"name\": \"RHBZ#2401209\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2026-06-01T03:03:58.100Z\"}, \"x_redhatCweChain\": \"CWE-416: Use After Free\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-11234\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-01T03:03:58.100Z\", \"dateReserved\": \"2025-10-01T17:03:04.737Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2025-10-03T10:30:34.427Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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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.