{"id":"CVE-2026-63622","state":"PUBLISHED","title":"Libvirt: swtpm privilege escalation via symlink following","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. 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code path from being reached.\n\nTo check if a domain uses vTPM:\n```\nvirsh dumpxml <domain> | grep -A5 '<tpm'\n```\n\nTo remove it, edit the domain XML and delete the <tpm> block. This prevents libvirt from spawning swtpm processes and from calling virFileChownFiles() on the swtpm state directory during domain startup. 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