7.8

CVE-2026-63622: libvirt Link Following

CVSS: 7.8v3.1HighAwaiting analysis
AliasesRHSA-2026:64773RHSA-2026:65515RHSA-2026:65516
Published 10-08-2026Last modified 05-10-2026
Open JSON

Vulnerability summary

CVE-2026-63622 is a high (CVSS 7.8) Link Following vulnerability in libvirt. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.1% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.14%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 18 · Related 12
OPENSUSE-SU-2026:21738-1RHSA-2026:68513RHSA-2026:68594RHSA-2026:69114RHSA-2026:69131RHSA-2026:74424

Timeline

  1. 10-08-2026
    PublishedVulnerability first disclosed.
  2. 05-10-2026
    Last modifiedVulnerability information updated.

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. This allows for privilege escalation from the `swtpm` sandbox to root-level file ownership control.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

+0.01 pp

From 0.13% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.14%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Redhat60 products
  • libvirt< 0:10.10.0-8.11.el10_0 | < 0:10.10.0-7.18.el9_6 | < 0:9.0.0-10.16.el9_2 | < 0:10.0.0-6.23.el9_4
  • libvirt-client< 0:10.10.0-8.11.el10_0 | < 0:10.10.0-7.18.el9_6 | < 0:9.0.0-10.16.el9_2 | < 0:10.0.0-6.23.el9_4
  • libvirt-client-debuginfo< 0:10.10.0-8.11.el10_0 | < 0:10.10.0-7.18.el9_6 | < 0:9.0.0-10.16.el9_2 | < 0:10.0.0-6.23.el9_4
  • libvirt-client-qemu< 0:10.10.0-8.11.el10_0 | < 0:10.10.0-7.18.el9_6 | < 0:10.0.0-6.23.el9_4
  • libvirt-daemon< 0:10.10.0-8.11.el10_0 | < 0:10.10.0-7.18.el9_6 | < 0:9.0.0-10.16.el9_2 | < 0:10.0.0-6.23.el9_4
Ubuntu2 products
  • libvirt< 6.0.0-0ubuntu8.20+esm1 | < 8.0.0-1ubuntu7.19 | < 10.0.0-2ubuntu8.16 | < 12.0.0-1ubuntu5.3
  • libvirt-hwe< 12.0.0-1ubuntu5.5
Debian1 product
  • libvirtAll versions (No fix recorded) | < 11.3.0-3+deb13u3 | < 12.6.0-1

3 vendors · 63 products

References

23 links
Show all 23 references