--- id: CVE-2026-63622 title: A flaw was found in libvirt summary: >- 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 `sw… severity: high cvss: 7.8 cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H' cwe: - CWE-59 vendor: Red Hat product: libvirt affected: - libvirt (all versions) - libvirt (all versions) - 'virt:rhel (all versions)' - 'virt:rhel (all versions)' - 'virt:rhel (all versions)' - 'virt:rhel (all versions)' - 'virt:rhel (all versions)' - 'virt:rhel (all versions)' - libvirt (all versions) - libvirt (all versions) - libvirt (all versions) - libvirt (all versions) - libvirt - 'virt:rhel/libvirt (all versions)' - libvirt (all versions) - libvirt patched: - enterprise_linux_appstream_eus_v_10_0 - enterprise_linux_codeready_linux_builder_eus_v_10_0 published: '2026-08-10' updated: '2026-09-21' sourceUpdated: '2026-09-21T06:17:01.757' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63622' references: - url: 'https://access.redhat.com/errata/RHSA-2026:64773' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:65515' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:65516' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:65803' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:68513' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:68594' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:69114' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:69131' label: secalert@redhat.com - url: 'https://access.redhat.com/security/cve/CVE-2026-63622' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2513065' label: secalert@redhat.com - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63622.json - url: 'https://www.cve.org/CVERecord?id=CVE-2026-63622' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63622' tags: - nvd - cve.org - csaf - vex - red-hat ssvc: exploitation: none automatable: 'no' technicalImpact: total timestamp: '2026-08-11T17:13:19.056016Z' epss: 0.00184 epssPercentile: 0.07139 ingestedAt: '2026-09-08T15:33:26.952Z' --- ## Overview 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. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2026:64773** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64773) - **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux for NVIDIA 26 · no fix planned: Red Hat Enterprise Linux for NVIDIA 26, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63622.json) - **RHSA-2026:65516** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65516) - **RHSA-2026:65515** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65515) - **RHSA-2026:65803** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-09-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:65803) - **RHSA-2026:68594** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68594) - **RHSA-2026:68513** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68513) - **RHSA-2026:69114** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS) · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69114) - **RHSA-2026:69131** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69131)