CVE-2025-11234
Full vulnerability record from the local CVENow database.
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.
Severity
HIGH
CVSS score
7.5
(v3.1)
Vulnerability status
Deferred
Source identifier
Published
2025-10-03 11:15:30.437000
Last modified
2026-10-18 21:10:00.120000
View original CVE JSON
{
"id": "CVE-2025-11234",
"sourceIdentifier": "[email protected]",
"published": "2025-10-03T11:15:30.437",
"lastModified": "2026-10-18T21:10:00.120",
"vulnStatus": "Deferred",
"cveTags": [],
"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."
},
{
"lang": "es",
"value": "Se encontró una falla en QEMU. Si el objeto QIOChannelWebsock se libera mientras espera completar un handshake, se filtra un GSource. Esto puede llevar a que la devolución de llamada se active más tarde y desencadene un uso después de liberación en el uso del canal. Esto puede ser explotado por un cliente malicioso con acceso de red al puerto WebSocket de VNC para causar una denegación de servicio durante el handshake de WebSocket antes de la autenticación del cliente VNC."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
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],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6
}
],
"ssvcV203": [
{
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"id": "CVE-2025-11234",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
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}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-416"
}
]
}
],
"references": [
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"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:0326",
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{
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{
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{
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{
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"source": "[email protected]"
},
{
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{
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},
{
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"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:68513",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:69131",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2025-11234",
"source": "[email protected]"
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2401209",
"source": "[email protected]"
}
]
}