CVE-2026-77159CWE-61

CVE-2026-77159

Medium · published September 11, 2026

CVSS v3.1
5.5
EPSS
0%
Percentile
5.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.5 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00162 · 5.1th percentile
Weakness
CWE-61 · UNIX Symbolic Link (Symlink) Following
Published
2026-09-11T15:16Z
References (4)
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]https://gitlab.com/libvirt/libvirt/-/work_items/909 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 13 SEP 03:23Z
    EPSS moved — → 0%
    epss
  • 11 SEP 10:32Z
    Libvirt: unsafe chown in qemutpmemulatorpreparehost() allows arbitrary file ownership change via symlink
    cvelistv5