Link Following Affecting libvirt-hwe package, versions <12.0.0-1ubuntu5.5


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.14% (3rd percentile)

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  • Snyk IDSNYK-UBUNTU2604-LIBVIRTHWE-19350549
  • published28 Sept 2026
  • disclosed10 Aug 2026

Introduced: 10 Aug 2026

CVE-2026-63622  (opens in a new tab)
CWE-59  (opens in a new tab)

How to fix?

Upgrade Ubuntu:26.04 libvirt-hwe to version 12.0.0-1ubuntu5.5 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libvirt-hwe package and not the libvirt-hwe package as distributed by Ubuntu. See How to fix? for Ubuntu:26.04 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1