Dashboard / CVE-2026-77159

CVE-2026-77159

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 36/100
Published: 2026-09-11 Modified: 2026-11-06 First seen: 2026-11-06 Status: active

Attack Surface

Low Complexity No Interaction Integ. Impact

CVSS Vector Breakdown

AV: Local
AC: Low
PR: Low
UI: None
S: Unchanged
C: None
I: High
A: None

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.

Weakness Classification (1)

References & Advisories (3)

https://bugzilla.redhat.com/show_bug.cgi?id=2531811
issue-tracking x_refsource_REDHAT

Bug Bounty Relevance

36 / 100
✓ Low complexity
✓ No user interaction

CVSS Score

5.5 / 10.0 v3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS — Exploitation Probability

0.16%
Raw Score 0.001620
Percentile 5.5%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00162
2026-11-12
0.00162
2026-11-10
0.00162
2026-11-09
0.00162
2026-11-08
0.00162
2026-11-07
0.00162
2026-11-06
0.00162
2026-11-05
0.00162

Intelligence Sources

mitre ref →
nvd ref →

External Links