CVE-2026-77159

Published: Sep 11, 2026Modified: Sep 16, 2026

5.5

Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Exploitability: 1.8 / Impact: 3.6

Source: secalert@redhat.com (Secondary)

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.

Related CWEs

CWE-61

UNIX Symbolic Link (Symlink) Following

The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files.

References (4)

https://access.redhat.com/security/cve/CVE-2026-77159

Source: secalert@redhat.com

https://bugzilla.redhat.com/show_bug.cgi?id=2531811

Source: secalert@redhat.com

https://gitlab.com/libvirt/libvirt/-/work_items/909

Source: secalert@redhat.com

https://gitlab.com/libvirt/libvirt/-/work_items/909

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Timeline

No history available yet.