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Back to active CVEs
Medium · CVSS 5.5CVE-2026-77159

Libvirt: unsafe chown in qemutpmemulatorpreparehost() allows arbitrary file ownership change via symlinkCVE-2026-77159

Answer in brief

CVE-2026-77159 records a Medium severity (CVSS 5.5) vulnerability in Libvirt: unsafe chown in qemutpmemulatorpreparehost() allows arbitrary file ownership change via symlink. The current sources do not mark it as known exploited. The current feed maps Red Hat/libvirt (generic), Red Hat/virt:rhel/libvirt (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 11, 2026Updated Sep 16, 2026Source checked Oct 27, 2026First seen by HOL Sep 11, 2026Material review Sep 16, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.5
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/libvirt (generic), Red Hat/virt:rhel/libvirt (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/libvirtgeneric*Not reported
Red Hat/virt:rhel/libvirtgeneric*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/libvirt, Red Hat/virt:rhel/libvirt.
  2. 2Review the reported fix. Source-reported workaround: On Red Hat Enterprise Linux, SELinux in enforcing mode (the default) confines the swtpm process to the swtpm_t domain, which restricts the creation of symlinks to arbitrary file types and limits the scope of any ownership change, reducing the practical impact of this flaw. Ensure SELinux is not disabled or set to permissive mode.

Evidence timeline and material changes

  1. Published upstream

    Sep 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 11, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • Source referencegitlab.com
Upstream source description

A symlink-following flaw was found in libvirt's qemuTPMEmulatorPrepareHost() function. The function uses a path-based chown() on the swtpm logfile without checking for symbolic links. A local attacker with access to the swtpm account can replace the logfile with a symlink, causing libvirtd (running as root) to transfer ownership of an arbitrary file to the swtpm user.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-61
Source
CVE List V5
Source checked
Oct 27, 2026
References
3 linked sources
Open source record