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VULNERABILITIES

CVE-2026-77159 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://gitlab.com/libvirt/libvirt/-/work_items/909 CISA-ADP
https://access.redhat.com/security/cve/CVE-2026-77159 [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=2531811 [email protected]
https://gitlab.com/libvirt/libvirt/-/work_items/909 [email protected]

Weakness Enumeration

CWE-IDCWE NameSource
CWE-61UNIX Symbolic Link (Symlink) Following[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-77159
NVD Published Date:
Sep 11, 2026
NVD Last Modified:
Sep 16, 2026
Source:
[email protected]
CVE-2026-77159 Details - Not Deferred