ubuntu-cve-2026-63622
Vulnerability from osv_ubuntu
Published
2026-08-13 00:00
Modified
2026-08-14 23:24
Summary
Details
A flaw was found in libvirt. A local attacker, specifically a process running as the confined swtpm user, could exploit a symlink-following vulnerability in the virFileChownFiles() function. By planting a symbolic link within the swtpm state directory, the attacker could trick the root-level libvirt daemon into changing the ownership of an arbitrary file to the swtpm user. This allows for privilege escalation from the swtpm sandbox to root-level file ownership control.
Severity
7.8 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnss-libvirt",
"binary_version": "6.0.0-0ubuntu8.20"
},
{
"binary_name": "libvirt-clients",
"binary_version": "6.0.0-0ubuntu8.20"
},
{
"binary_name": "libvirt-daemon",
"binary_version": "6.0.0-0ubuntu8.20"
},
{
"binary_name": "libvirt-daemon-driver-lxc",
"binary_version": "6.0.0-0ubuntu8.20"
},
{
"binary_name": "libvirt-daemon-driver-qemu",
"binary_version": "6.0.0-0ubuntu8.20"
},
{
"binary_name": "libvirt-daemon-driver-storage-gluster",
"binary_version": "6.0.0-0ubuntu8.20"
},
{
"binary_name": "libvirt-daemon-driver-storage-rbd",
"binary_version": "6.0.0-0ubuntu8.20"
},
{
"binary_name": "libvirt-daemon-driver-storage-zfs",
"binary_version": "6.0.0-0ubuntu8.20"
},
{
"binary_name": "libvirt-daemon-driver-vbox",
"binary_version": "6.0.0-0ubuntu8.20"
},
{
"binary_name": "libvirt-daemon-driver-xen",
"binary_version": "6.0.0-0ubuntu8.20"
},
{
"binary_name": "libvirt-daemon-system",
"binary_version": "6.0.0-0ubuntu8.20"
},
{
"binary_name": "libvirt-daemon-system-systemd",
"binary_version": "6.0.0-0ubuntu8.20"
},
{
"binary_name": "libvirt-daemon-system-sysv",
"binary_version": "6.0.0-0ubuntu8.20"
},
{
"binary_name": "libvirt-sanlock",
"binary_version": "6.0.0-0ubuntu8.20"
},
{
"binary_name": "libvirt-wireshark",
"binary_version": "6.0.0-0ubuntu8.20"
},
{
"binary_name": "libvirt0",
"binary_version": "6.0.0-0ubuntu8.20"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "libvirt",
"purl": "pkg:deb/ubuntu/libvirt@6.0.0-0ubuntu8.20?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.4.0-0ubuntu5",
"6.0.0-0ubuntu1",
"6.0.0-0ubuntu2",
"6.0.0-0ubuntu3",
"6.0.0-0ubuntu4",
"6.0.0-0ubuntu5",
"6.0.0-0ubuntu6",
"6.0.0-0ubuntu7",
"6.0.0-0ubuntu8",
"6.0.0-0ubuntu8.1",
"6.0.0-0ubuntu8.2",
"6.0.0-0ubuntu8.3",
"6.0.0-0ubuntu8.4",
"6.0.0-0ubuntu8.5",
"6.0.0-0ubuntu8.7",
"6.0.0-0ubuntu8.8",
"6.0.0-0ubuntu8.9",
"6.0.0-0ubuntu8.10",
"6.0.0-0ubuntu8.11",
"6.0.0-0ubuntu8.12",
"6.0.0-0ubuntu8.13",
"6.0.0-0ubuntu8.14",
"6.0.0-0ubuntu8.15",
"6.0.0-0ubuntu8.16",
"6.0.0-0ubuntu8.19",
"6.0.0-0ubuntu8.20"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnss-libvirt",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt-clients",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt-daemon",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt-daemon-config-network",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt-daemon-config-nwfilter",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt-daemon-driver-lxc",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt-daemon-driver-qemu",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt-daemon-driver-storage-gluster",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt-daemon-driver-storage-iscsi-direct",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt-daemon-driver-storage-rbd",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt-daemon-driver-storage-zfs",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt-daemon-driver-vbox",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt-daemon-driver-xen",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt-daemon-system",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt-daemon-system-systemd",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt-daemon-system-sysv",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt-login-shell",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt-sanlock",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt-wireshark",
"binary_version": "8.0.0-1ubuntu7.18"
},
{
"binary_name": "libvirt0",
"binary_version": "8.0.0-1ubuntu7.18"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "libvirt",
"purl": "pkg:deb/ubuntu/libvirt@8.0.0-1ubuntu7.18?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"7.6.0-0ubuntu1",
"7.6.0-0ubuntu3",
"8.0.0-1ubuntu3",
"8.0.0-1ubuntu4",
"8.0.0-1ubuntu5",
"8.0.0-1ubuntu6",
"8.0.0-1ubuntu7",
"8.0.0-1ubuntu7.1",
"8.0.0-1ubuntu7.2",
"8.0.0-1ubuntu7.3",
"8.0.0-1ubuntu7.4",
"8.0.0-1ubuntu7.5",
"8.0.0-1ubuntu7.6",
"8.0.0-1ubuntu7.7",
"8.0.0-1ubuntu7.8",
"8.0.0-1ubuntu7.9",
"8.0.0-1ubuntu7.10",
"8.0.0-1ubuntu7.11",
"8.0.0-1ubuntu7.12",
"8.0.0-1ubuntu7.13",
"8.0.0-1ubuntu7.14",
"8.0.0-1ubuntu7.15",
"8.0.0-1ubuntu7.16",
"8.0.0-1ubuntu7.17",
"8.0.0-1ubuntu7.18"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnss-libvirt",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-clients",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-clients-qemu",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-daemon",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-daemon-config-network",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-daemon-config-nwfilter",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-daemon-driver-lxc",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-daemon-driver-qemu",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-daemon-driver-storage-gluster",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-daemon-driver-storage-iscsi-direct",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-daemon-driver-storage-rbd",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-daemon-driver-storage-zfs",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-daemon-driver-vbox",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-daemon-driver-xen",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-daemon-system",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-daemon-system-systemd",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-daemon-system-sysv",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-l10n",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-login-shell",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-sanlock",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt-wireshark",
"binary_version": "10.0.0-2ubuntu8.15"
},
{
"binary_name": "libvirt0",
"binary_version": "10.0.0-2ubuntu8.15"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "libvirt",
"purl": "pkg:deb/ubuntu/libvirt@10.0.0-2ubuntu8.15?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"9.6.0-1ubuntu1",
"9.6.0-1ubuntu2",
"10.0.0-1ubuntu1",
"10.0.0-2ubuntu1",
"10.0.0-2ubuntu5",
"10.0.0-2ubuntu7",
"10.0.0-2ubuntu8",
"10.0.0-2ubuntu8.1",
"10.0.0-2ubuntu8.2",
"10.0.0-2ubuntu8.3",
"10.0.0-2ubuntu8.4",
"10.0.0-2ubuntu8.5",
"10.0.0-2ubuntu8.6",
"10.0.0-2ubuntu8.7",
"10.0.0-2ubuntu8.8",
"10.0.0-2ubuntu8.9",
"10.0.0-2ubuntu8.10",
"10.0.0-2ubuntu8.11",
"10.0.0-2ubuntu8.12",
"10.0.0-2ubuntu8.13",
"10.0.0-2ubuntu8.14",
"10.0.0-2ubuntu8.15"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnss-libvirt",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-clients",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-clients-qemu",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-common",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-common",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-config-network",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-config-nwfilter",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-interface",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-lxc",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-network",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-nodedev",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-nwfilter",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-qemu",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-secret",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-storage",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-storage-disk",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-storage-gluster",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-storage-iscsi",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-storage-iscsi-direct",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-storage-logical",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-storage-mpath",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-storage-rbd",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-storage-scsi",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-storage-zfs",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-vbox",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-driver-xen",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-lock",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-log",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-plugin-lockd",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-plugin-sanlock",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-system",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-system-systemd",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-daemon-system-sysv",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-l10n",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-login-shell",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-sanlock",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-ssh-proxy",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt-wireshark",
"binary_version": "12.0.0-1ubuntu5.2"
},
{
"binary_name": "libvirt0",
"binary_version": "12.0.0-1ubuntu5.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "libvirt",
"purl": "pkg:deb/ubuntu/libvirt@12.0.0-1ubuntu5.2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"11.6.0-1ubuntu3",
"11.6.0-1ubuntu5",
"11.6.0-1ubuntu6",
"11.6.0-1ubuntu7",
"11.6.0-1ubuntu8",
"12.0.0-1ubuntu3",
"12.0.0-1ubuntu5",
"12.0.0-1ubuntu5.1",
"12.0.0-1ubuntu5.2"
]
}
],
"aliases": [],
"details": "A flaw was found in libvirt. A local attacker, specifically a process running as the confined `swtpm` user, could exploit a symlink-following vulnerability in the `virFileChownFiles()` function. By planting a symbolic link within the `swtpm` state directory, the attacker could trick the root-level libvirt daemon into changing the ownership of an arbitrary file to the `swtpm` user. This allows for privilege escalation from the `swtpm` sandbox to root-level file ownership control.",
"id": "UBUNTU-CVE-2026-63622",
"modified": "2026-08-14T23:24:43Z",
"published": "2026-08-13T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-63622"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-63622"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513065"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-63622"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-63622"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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