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AlienVault OTX Malware

libvirt

A vulnerability in the libvirt library allows a local attacker running as the confined swtpm user to escalate privileges by exploiting a symlink-following flaw. The attacker can trick the root-level libvirt daemon into changing ownership of arbitrary files to the swtpm user, resulting in privilege escalation. This affects certain versions of libvirt used in Red Hat and Ubuntu distributions. Mitigation includes removing the <tpm> device from domain XML if virtual TPM functionality is not required. A fix is available from Red Hat upstream.

CVE-2026-63622 is a local privilege escalation vulnerability in libvirt's virFileChownFiles() function caused by improper symlink resolution (CWE-59). A process running as the confined swtpm user can plant a symbolic link in the swtpm state directory, causing the root-level libvirt daemon to change ownership of arbitrary files to the swtpm user. This allows escalation from the swtpm sandbox to root-level file ownership control. The vulnerability affects multiple specific versions of libvirt distributed by Red Hat and Ubuntu. Mitigation involves removing the <tpm> device from domain XML to prevent libvirt from spawning swtpm processes and invoking the vulnerable code path. Domains requiring vTPM must apply the upstream fix. The vulnerability has a Red Hat CVSS v3.1 base score of 7.8 (high severity).

Detailed information about A flaw was found in libvirt. A local attacker, specifically a process running as the confined swtpm user, could exploit a symlink-fol

A flaw was found in libvirt. A local attacker, specifically a process running as the confined swtpm user, could exploit a symlink-following… (CVE-2026-63622) - Live Threat Intelligence - Threat Radar | OffSeq.com

https://access.redhat.com/errata/RHSA-2026:65515

https://access.redhat.com/security/updates/classification/#important

Canonical URL

Red Hat Security Advisory: libvirt security, bug fix, and enhancement update

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