CVE-2026-63622
Publication date 10 August 2026
Last updated 28 September 2026
Ubuntu priority
Description
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| libvirt | 26.04 LTS resolute |
Fixed 12.0.0-1ubuntu5.3
|
| 24.04 LTS noble |
Fixed 10.0.0-2ubuntu8.16
|
|
| 22.04 LTS jammy |
Fixed 8.0.0-1ubuntu7.19
|
|
| 20.04 LTS focal |
Fixed 6.0.0-0ubuntu8.20+esm1
|
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty |
Not affected
|
|
| libvirt-hwe | 26.04 LTS resolute |
Fixed 12.0.0-1ubuntu5.5
|
| 24.04 LTS noble | Not in release | |
| 22.04 LTS jammy | Not in release |
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CVSS version: CVSS v3.0
Base score
7.8 · High
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8833-1
- libvirt vulnerabilities
- 28 September 2026