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CVE-2026-63622VulnerabilityPublished Updated

libvirt

Affects libvirtSource GCVE Database

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Authoritative record:CVE-2026-63622· High 7.8

Not known to be exploited · CVSS 7.8 High · fixed in 6.0.0-0ubuntu8.20+esm1 : patch libvirt soon.

Data as of 12 Nov 2026, 23:24 UTC

CVSS 3.1 base score
7.8High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (redhat)CVSS 3.17.8
EPSS
0.1% chance of exploitation in 30 days – higher than 3% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 6.0.0-0ubuntu8.20+esm1, 8.0.0-1ubuntu7.19, 10.0.0-2ubuntu8.16 +2
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
Ubuntu 26.04 LTSlibvirtpkg:deb/ubuntu/libvirt?arch=source&distro=resoluteOther threatsAffected
  • <12.0.0-1ubuntu5.3
Fixed in
  • 12.0.0-1ubuntu5.3
Ubuntu 26.04 LTSlibvirt-hwepkg:deb/ubuntu/libvirt-hwe?arch=source&distro=resoluteOther threatsAffected
  • <12.0.0-1ubuntu5.5
Fixed in
  • 12.0.0-1ubuntu5.5
Ubuntu 24.04 LTSlibvirtpkg:deb/ubuntu/libvirt?arch=source&distro=nobleOther threatsAffected
  • <10.0.0-2ubuntu8.16
Fixed in
  • 10.0.0-2ubuntu8.16
Ubuntu 22.04 LTSlibvirtpkg:deb/ubuntu/libvirt?arch=source&distro=jammyOther threatsAffected
  • <8.0.0-1ubuntu7.19
Fixed in
  • 8.0.0-1ubuntu7.19
Ubuntu Pro 20.04 LTSlibvirtpkg:deb/ubuntu/libvirt?arch=source&distro=esm-infra/focalOther threatsAffected
  • <6.0.0-0ubuntu8.20+esm1
Fixed in
  • 6.0.0-0ubuntu8.20+esm1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

If virtual TPM (vTPM) functionality is not required, remove the <tpm> device definition from the domain XML configuration to prevent the vulnerable code path from being triggered. For domains requiring vTPM, prioritize applying the official patches provided in libvirt versions 6.0.0-0ubuntu8.20+esm1, 8.0.0-1ubuntu7.19, 10.0.0-2ubuntu8.16, 12.0.0-1ubuntu5.3, and 12.0.0-1ubuntu5.5. Refer to the Ubuntu security notices USN-8652-1 and USN-8833-1 for patch details. No other mitigations are indicated by the vendor advisory.

Description

A local privilege escalation vulnerability exists in libvirt's virFileChownFiles() function, exploitable by a process running as the confined swtpm user. By creating a symbolic link in the swtpm state directory, an attacker can cause the root-level libvirt daemon to change ownership of arbitrary files to the swtpm user, effectively gaining root-level file ownership control. This flaw affects multiple versions of libvirt prior to fixed releases. Mitigation includes removing the vTPM device from domain XML configurations if vTPM functionality is not required, or applying the available patches.

References

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