HighFix available
qemu — security advisory
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.
- Products
- qemu
- Affected versions
- 1:10.0.2+ds-2, 1:10.0.2+ds-2+deb13u1, 1:10.0.2+ds-2+deb13u1~bpo12+1, 1:10.0.3+ds-0+deb13u1, 1:10.0.3+ds-1, 1:10.0.3+ds-2, 1:10.0.3+ds-3, 1:10.0.3+ds-4, 1:10.0.6+ds-0+deb13u1, 1:10.0.6+ds-0+deb13u2, 1:10.1.0+ds-1, 1:10.1.0+ds-2, 1:10.1.0+ds-3, 1:10.1.0+ds-4, 1:10.1.0+ds-5, 1:10.1.0~rc0+ds-1, 1:10.1.0~rc0+ds-2, 1:10.1.0~rc0+ds-3, 1:10.1.0~rc0+ds-4, 1:10.1.0~rc1+ds-1, 1:10.1.0~rc1+ds-1a, 1:10.1.0~rc1+ds-1b, 1:10.1.0~rc1+ds-2, 1:10.1.0~rc1+ds-3, 1:10.1.0~rc2+ds-1, 1:10.1.0~rc3+ds-1, 1:10.1.0~rc3+ds-2, 1:10.1.1+ds-1, 1:10.1.2+ds-1, 1:10.1.2+ds-2, 1:10.1.2+ds-3, 1:7.2+dfsg-7, 1:7.2+dfsg-7+deb12u1, 1:7.2+dfsg-7+deb12u10, 1:7.2+dfsg-7+deb12u11, 1:7.2+dfsg-7+deb12u12, 1:7.2+dfsg-7+deb12u13, 1:7.2+dfsg-7+deb12u14, 1:7.2+dfsg-7+deb12u15, 1:7.2+dfsg-7+deb12u16, 1:7.2+dfsg-7+deb12u17, 1:7.2+dfsg-7+deb12u2, 1:7.2+dfsg-7+deb12u2~bpo11+1, 1:7.2+dfsg-7+deb12u3, 1:7.2+dfsg-7+deb12u4, 1:7.2+dfsg-7+deb12u5, 1:7.2+dfsg-7+deb12u6, 1:7.2+dfsg-7+deb12u7, 1:7.2+dfsg-7+deb12u8, 1:7.2+dfsg-7+deb12u9
- Fixed versions
- 1:10.0.7+ds-0+deb13u1, 1:10.1.3+ds-1, 1:7.2+dfsg-7+deb12u18
- CVEs
- CVE-2025-11234
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 23:03 UTC · Revision 1
Source evidence
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.
osv:DEBIAN-CVE-2025-11234
qemu
Fixed versions: 1:7.2+dfsg-7+deb12u18
qemu
Fixed versions: 1:10.0.7+ds-0+deb13u1
qemu
Fixed versions: 1:10.1.3+ds-1
Complete source record
{
"id": "de808e98bee3b215a285108b1e314ad6dc4fcdda887f9e75a1762c55fa29ed84",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2025-11234",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2025-11234",
"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.",
"evidence": "osv:DEBIAN-CVE-2025-11234",
"products": [
{
"name": {
"value": "qemu",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:7.2+dfsg-7+deb12u18",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "1:7.2+dfsg-7",
"evidence": "/affected/0/versions"
},
{
"value": "1:7.2+dfsg-7+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:7.2+dfsg-7+deb12u10",
"evidence": "/affected/0/versions"
},
{
"value": "1:7.2+dfsg-7+deb12u11",
"evidence": "/affected/0/versions"
},
{
"value": "1:7.2+dfsg-7+deb12u12",
"evidence": "/affected/0/versions"
},
{
"value": "1:7.2+dfsg-7+deb12u13",
"evidence": "/affected/0/versions"
},
{
"value": "1:7.2+dfsg-7+deb12u14",
"evidence": "/affected/0/versions"
},
{
"value": "1:7.2+dfsg-7+deb12u15",
"evidence": "/affected/0/versions"
},
{
"value": "1:7.2+dfsg-7+deb12u16",
"evidence": "/affected/0/versions"
},
{
"value": "1:7.2+dfsg-7+deb12u17",
"evidence": "/affected/0/versions"
},
{
"value": "1:7.2+dfsg-7+deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "1:7.2+dfsg-7+deb12u2~bpo11+1",
"evidence": "/affected/0/versions"
},
{
"value": "1:7.2+dfsg-7+deb12u3",
"evidence": "/affected/0/versions"
},
{
"value": "1:7.2+dfsg-7+deb12u4",
"evidence": "/affected/0/versions"
},
{
"value": "1:7.2+dfsg-7+deb12u5",
"evidence": "/affected/0/versions"
},
{
"value": "1:7.2+dfsg-7+deb12u6",
"evidence": "/affected/0/versions"
},
{
"value": "1:7.2+dfsg-7+deb12u7",
"evidence": "/affected/0/versions"
},
{
"value": "1:7.2+dfsg-7+deb12u8",
"evidence": "/affected/0/versions"
},
{
"value": "1:7.2+dfsg-7+deb12u9",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "qemu",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:10.0.7+ds-0+deb13u1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "1:10.0.2+ds-2",
"evidence": "/affected/1/versions"
},
{
"value": "1:10.0.2+ds-2+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "1:10.0.2+ds-2+deb13u1~bpo12+1",
"evidence": "/affected/1/versions"
},
{
"value": "1:10.0.3+ds-0+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "1:10.0.3+ds-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:10.0.3+ds-2",
"evidence": "/affected/1/versions"
},
{
"value": "1:10.0.3+ds-3",
"evidence": "/affected/1/versions"
},
{
"value": "1:10.0.3+ds-4",
"evidence": "/affected/1/versions"
},
{
"value": "1:10.0.6+ds-0+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "1:10.0.6+ds-0+deb13u2",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "qemu",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:10.1.3+ds-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "1:10.0.2+ds-2",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.0.3+ds-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.0.3+ds-2",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.0.3+ds-3",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.0.3+ds-4",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.0+ds-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.0+ds-2",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.0+ds-3",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.0+ds-4",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.0+ds-5",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.0~rc0+ds-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.0~rc0+ds-2",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.0~rc0+ds-3",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.0~rc0+ds-4",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.0~rc1+ds-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.0~rc1+ds-1a",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.0~rc1+ds-1b",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.0~rc1+ds-2",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.0~rc1+ds-3",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.0~rc2+ds-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.0~rc3+ds-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.0~rc3+ds-2",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.1+ds-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.2+ds-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.2+ds-2",
"evidence": "/affected/2/versions"
},
{
"value": "1:10.1.2+ds-3",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2025-11234",
"aliases": [
"DEBIAN-CVE-2025-11234"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:7.2+dfsg-7+deb12u18"
}
]
}
],
"package": {
"name": "qemu",
"purl": "pkg:deb/debian/qemu?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1:7.2+dfsg-7",
"1:7.2+dfsg-7+deb12u1",
"1:7.2+dfsg-7+deb12u10",
"1:7.2+dfsg-7+deb12u11",
"1:7.2+dfsg-7+deb12u12",
"1:7.2+dfsg-7+deb12u13",
"1:7.2+dfsg-7+deb12u14",
"1:7.2+dfsg-7+deb12u15",
"1:7.2+dfsg-7+deb12u16",
"1:7.2+dfsg-7+deb12u17",
"1:7.2+dfsg-7+deb12u2",
"1:7.2+dfsg-7+deb12u2~bpo11+1",
"1:7.2+dfsg-7+deb12u3",
"1:7.2+dfsg-7+deb12u4",
"1:7.2+dfsg-7+deb12u5",
"1:7.2+dfsg-7+deb12u6",
"1:7.2+dfsg-7+deb12u7",
"1:7.2+dfsg-7+deb12u8",
"1:7.2+dfsg-7+deb12u9"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-11234.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:10.0.7+ds-0+deb13u1"
}
]
}
],
"package": {
"name": "qemu",
"purl": "pkg:deb/debian/qemu?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1:10.0.2+ds-2",
"1:10.0.2+ds-2+deb13u1",
"1:10.0.2+ds-2+deb13u1~bpo12+1",
"1:10.0.3+ds-0+deb13u1",
"1:10.0.3+ds-1",
"1:10.0.3+ds-2",
"1:10.0.3+ds-3",
"1:10.0.3+ds-4",
"1:10.0.6+ds-0+deb13u1",
"1:10.0.6+ds-0+deb13u2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-11234.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:10.1.3+ds-1"
}
]
}
],
"package": {
"name": "qemu",
"purl": "pkg:deb/debian/qemu?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1:10.0.2+ds-2",
"1:10.0.3+ds-1",
"1:10.0.3+ds-2",
"1:10.0.3+ds-3",
"1:10.0.3+ds-4",
"1:10.1.0+ds-1",
"1:10.1.0+ds-2",
"1:10.1.0+ds-3",
"1:10.1.0+ds-4",
"1:10.1.0+ds-5",
"1:10.1.0~rc0+ds-1",
"1:10.1.0~rc0+ds-2",
"1:10.1.0~rc0+ds-3",
"1:10.1.0~rc0+ds-4",
"1:10.1.0~rc1+ds-1",
"1:10.1.0~rc1+ds-1a",
"1:10.1.0~rc1+ds-1b",
"1:10.1.0~rc1+ds-2",
"1:10.1.0~rc1+ds-3",
"1:10.1.0~rc2+ds-1",
"1:10.1.0~rc3+ds-1",
"1:10.1.0~rc3+ds-2",
"1:10.1.1+ds-1",
"1:10.1.2+ds-1",
"1:10.1.2+ds-2",
"1:10.1.2+ds-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-11234.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-23T17:47:33.476702953Z",
"provider": "osv",
"upstream": [
"CVE-2025-11234"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2025-11234"
]
},
"related_cves": [
{
"value": "CVE-2025-11234",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 417609,
"published_at": "2025-10-03T11:15:30.437+00:00"
}