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Fencer Intel
high 7.8

CVE-2026-63622 json

Libvirt: swtpm privilege escalation via symlink following

published 3mo ago modified 7d ago also EUVD-2026-55823

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

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 `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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:11.10.0-12.9.el10_2
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:10.10.0-8.11.el10_0
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:4.5.0-36.el7_9.7
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 8040020260916092751.522a0ee4
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 8040020260916092751.522a0ee4
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 8060020260910092451.ad008a3a
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 8060020260910092451.ad008a3a
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 8080020260910092120.63b34585
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 8080020260910092120.63b34585
  • Red Hat Red Hat Enterprise Linux 9 0:11.10.0-12.7.el9_8
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:9.0.0-10.16.el9_2
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:10.0.0-6.23.el9_4
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:10.10.0-7.18.el9_6
  • libvirt Debian 13 11.3.0-3+deb13u3
  • libvirt Debian 14 12.6.0-1

debian advisories DEBIAN-CVE-2026-63622

  • libvirt Ubuntu 22.04 LTS 8.0.0-1ubuntu7.19
  • libvirt Ubuntu 24.04 LTS 10.0.0-2ubuntu8.16
  • libvirt Ubuntu 26.04 LTS 12.0.0-1ubuntu5.3
  • libvirt-hwe Ubuntu 26.04 LTS 12.0.0-1ubuntu5.5
  • libvirt Ubuntu Pro 20.04 LTS 6.0.0-0ubuntu8.20+esm1

ubuntu advisories UBUNTU-CVE-2026-63622

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libvirt RHEL 10.2 11.10.0-12.9.el10_2
  • libvirt-nss RHEL 10.2 11.10.0-12.9.el10_2
  • libvirt-libs RHEL 10.2 11.10.0-12.9.el10_2
  • libvirt-client RHEL 10.2 11.10.0-12.9.el10_2
  • libvirt-daemon RHEL 10.2 11.10.0-12.9.el10_2
  • libvirt-ssh-proxy RHEL 10.2 11.10.0-12.9.el10_2
  • libvirt-daemon-kvm RHEL 10.2 11.10.0-12.9.el10_2
  • libvirt-daemon-log RHEL 10.2 11.10.0-12.9.el10_2

red hat advisories RHSA-2026:75583RHSA-2026:74424RHSA-2026:69131RHSA-2026:69114RHSA-2026:68594RHSA-2026:68513

  • libvirt SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 9.0.0-150500.6.29.1
  • libvirt SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +3 more 8.0.0-150400.7.17.1
  • libvirt SLE Module for Server Applications 15 SP7, SLE Module for Basesystem 15 SP7 11.0.0-150700.4.27.1
  • libvirt SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 11.4.0-160000.5.1
  • libvirt Linux Micro 6.0 10.0.0-5.1
  • libvirt Linux Micro 6.1 10.0.0-slfo.1.1_3.1
  • libvirt SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 5.1.0-13.48.1
  • libvirt SLES for SAP 15 SP6, SLES 15 SP6-LTSS 10.0.0-150600.8.18.1

suse advisories SUSE-SU-2026:4141-1SUSE-SU-2026:4010-1SUSE-SU-2026:4009-1SUSE-SU-2026:4004-1SUSE-SU-2026:3939-1SUSE-SU-2026:23460-1

  • libvirt openSUSE Leap 16.0 11.4.0-160000.5.1

opensuse advisories openSUSE-SU-2026:21738-1

  • libvirt AlmaLinux 10 11.10.0-12.9.el10_2.alma.1
  • libvirt-nss AlmaLinux 10 11.10.0-12.9.el10_2.alma.1
  • libvirt-libs AlmaLinux 10 11.10.0-12.9.el10_2.alma.1
  • libvirt-client AlmaLinux 10 11.10.0-12.9.el10_2.alma.1
  • libvirt-daemon AlmaLinux 10 11.10.0-12.9.el10_2.alma.1
  • libvirt-ssh-proxy AlmaLinux 10 11.10.0-12.9.el10_2.alma.1
  • libvirt-daemon-kvm AlmaLinux 10 11.10.0-12.9.el10_2.alma.1
  • libvirt-daemon-log AlmaLinux 10 11.10.0-12.9.el10_2.alma.1

almalinux advisories ALSA-2026:75583ALSA-2026:74424

  • libvirt Rocky Linux 10 11.10.0-12.9.el10_2
  • libvirt Rocky Linux 9 11.10.0-12.7.el9_8

rocky linux advisories RLSA-2026:75583RLSA-2026:74424

  • libvirt Azure Linux 3.0 11.9.0-1

azure linux advisories AZL-95616

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-63622 updated cvss 7.8

libvirt: swtpm privilege escalation via symlink following

  • Red Hat Enterprise Linux 8 libvirt, libvirt-nss, libvirt-libs, libvirt-admin, libvirt-client, libvirt-daemon, +22 more
    affected: workaround, no fix available
  • Red Hat Enterprise Linux for NVIDIA 26 libvirt
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libvirt-daemon-plugin-sanlock 10.10.0-7.18.el9_6
    fixed: vendor fix RHSA-2026:65515
  • Red Hat Enterprise Linux AppStream (v. 9) libvirt 11.10.0-12.7.el9_8, libvirt-nss 11.10.0-12.7.el9_8, libvirt-libs 11.10.0-12.7.el9_8, libvirt-client 11.10.0-12.7.el9_8, libvirt-daemon 11.10.0-12.7.el9_8, libvirt-ssh-proxy 11.10.0-12.7.el9_8, +23 more
    fixed: vendor fix RHSA-2026:74424
  • Red Hat Enterprise Linux AppStream (v. 10) libvirt 11.10.0-12.9.el10_2, libvirt-nss 11.10.0-12.9.el10_2, libvirt-libs 11.10.0-12.9.el10_2, libvirt-client 11.10.0-12.9.el10_2, libvirt-daemon 11.10.0-12.9.el10_2, libvirt-ssh-proxy 11.10.0-12.9.el10_2, +23 more
    fixed: vendor fix RHSA-2026:75583
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) libnbd 1.2.2-1.module+el8.3.0+7353+9de0a3cc, netcf 0.2.8-12.module+el8.1.0+4066+0f1aadab, nbdfuse 1.2.2-1.module+el8.3.0+7353+9de0a3cc, nbdkit 1.16.2-4.module+el8.3.0+6922+fd575af8, hivex 1.3.18-21.module+el8.4.0+10770+19c037f9, seabios 1.13.0-2.module+el8.3.0+7353+9de0a3cc, +87 more
    fixed: vendor fix RHSA-2026:69131
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) libnbd 1.6.0-5.module+el8.6.0+14480+c0a3aa0f, netcf 0.2.8-12.module+el8.6.0+14480+c0a3aa0f, hivex 1.3.18-23.module+el8.6.0+14480+c0a3aa0f, nbdfuse 1.6.0-5.module+el8.6.0+14480+c0a3aa0f, nbdkit 1.24.0-4.module+el8.6.0+14480+c0a3aa0f, supermin 5.2.1-1.module+el8.6.0+14480+c0a3aa0f, +103 more
    fixed: vendor fix RHSA-2026:68594
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) libnbd 1.6.0-5.module+el8.8.0+16781+9f4724c2, netcf 0.2.8-12.module+el8.8.0+16781+9f4724c2, hivex 1.3.18-23.module+el8.8.0+16781+9f4724c2, nbdfuse 1.6.0-5.module+el8.8.0+16781+9f4724c2, nbdkit 1.24.0-5.module+el8.8.0+17308+05924798, SLOF 20210217-2.module+el8.8.0+20737+daad9f3b, +104 more
    fixed: vendor fix RHSA-2026:68513
show 12 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) libvirt 9.0.0-10.16.el9_2, libvirt-nss 9.0.0-10.16.el9_2, libvirt-libs 9.0.0-10.16.el9_2, libvirt-client 9.0.0-10.16.el9_2, libvirt-daemon 9.0.0-10.16.el9_2, libvirt-daemon-kvm 9.0.0-10.16.el9_2, +16 more
    fixed: vendor fix RHSA-2026:65516
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) libvirt 10.0.0-6.23.el9_4, libvirt-nss 10.0.0-6.23.el9_4, libvirt-libs 10.0.0-6.23.el9_4, libvirt-client 10.0.0-6.23.el9_4, libvirt-daemon 10.0.0-6.23.el9_4, libvirt-daemon-kvm 10.0.0-6.23.el9_4, +22 more
    fixed: vendor fix RHSA-2026:65803
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) libvirt 10.10.0-8.11.el10_0, libvirt-nss 10.10.0-8.11.el10_0, libvirt-libs 10.10.0-8.11.el10_0, libvirt-client 10.10.0-8.11.el10_0, libvirt-daemon 10.10.0-8.11.el10_0, libvirt-ssh-proxy 10.10.0-8.11.el10_0, +23 more
    fixed: vendor fix RHSA-2026:64773
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) libvirt 10.10.0-7.18.el9_6, libvirt-nss 10.10.0-7.18.el9_6, libvirt-libs 10.10.0-7.18.el9_6, libvirt-client 10.10.0-7.18.el9_6, libvirt-daemon 10.10.0-7.18.el9_6, libvirt-ssh-proxy 10.10.0-7.18.el9_6, +23 more
    fixed: vendor fix RHSA-2026:65515
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) libnbd 1.2.2-1.module+el8.3.0+7353+9de0a3cc, netcf 0.2.8-12.module+el8.1.0+4066+0f1aadab, nbdfuse 1.2.2-1.module+el8.3.0+7353+9de0a3cc, nbdkit 1.16.2-4.module+el8.3.0+6922+fd575af8, hivex 1.3.18-21.module+el8.4.0+10770+19c037f9, seabios 1.13.0-2.module+el8.3.0+7353+9de0a3cc, +88 more
    fixed: vendor fix RHSA-2026:69131
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) libnbd 1.6.0-5.module+el8.6.0+14480+c0a3aa0f, netcf 0.2.8-12.module+el8.6.0+14480+c0a3aa0f, hivex 1.3.18-23.module+el8.6.0+14480+c0a3aa0f, nbdfuse 1.6.0-5.module+el8.6.0+14480+c0a3aa0f, nbdkit 1.24.0-4.module+el8.6.0+14480+c0a3aa0f, SLOF 20210217-1.module+el8.6.0+14480+c0a3aa0f, +104 more
    fixed: vendor fix RHSA-2026:68594
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) libnbd 1.6.0-5.module+el8.8.0+16781+9f4724c2, netcf 0.2.8-12.module+el8.8.0+16781+9f4724c2, hivex 1.3.18-23.module+el8.8.0+16781+9f4724c2, nbdfuse 1.6.0-5.module+el8.8.0+16781+9f4724c2, nbdkit 1.24.0-5.module+el8.8.0+17308+05924798, seabios 1.16.0-4.module+el8.8.0+19627+2d14cb21, +103 more
    fixed: vendor fix RHSA-2026:68513
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libvirt-daemon-plugin-sanlock 11.10.0-12.7.el9_8
    fixed: vendor fix RHSA-2026:74424
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libvirt-daemon-plugin-sanlock 11.10.0-12.9.el10_2
    fixed: vendor fix RHSA-2026:75583
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libvirt-daemon-plugin-sanlock 10.10.0-8.11.el10_0
    fixed: vendor fix RHSA-2026:64773
  • Red Hat Enterprise Linux Server (v. 7 ELS) libvirt 4.5.0-36.el7_9.7, libvirt-libs 4.5.0-36.el7_9.7, libvirt-client 4.5.0-36.el7_9.7, libvirt-daemon 4.5.0-36.el7_9.7, libvirt-daemon-kvm 4.5.0-36.el7_9.7, libvirt-bash-completion 4.5.0-36.el7_9.7, +18 more Red Hat Enterprise Linux Server Optional (v. 7 ELS) libvirt-nss 4.5.0-36.el7_9.7, libvirt-admin 4.5.0-36.el7_9.7, libvirt-daemon-lxc 4.5.0-36.el7_9.7, libvirt-login-shell 4.5.0-36.el7_9.7, libvirt-lock-sanlock 4.5.0-36.el7_9.7
    fixed: vendor fix RHSA-2026:69114
  • Red Hat Enterprise Linux 6 libvirt, libvirt-client, libvirt-python, libvirt-lock-sanlock
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
3mo ago

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux for NVIDIA 26

Classification

Weakness
  • CWE-59 Improper Link Resolution Before File Access

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.