# CVE-2026-77159

## Summary

- **CVE ID:** CVE-2026-77159
- **Severity:** MEDIUM
- **CVSS Score:** 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N)
- **CWE:** CWE-61
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 15, 2026

## 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.

## Affected Products

No affected products listed.

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-77159)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2531811)
- [CNA](https://gitlab.com/libvirt/libvirt/-/work_items/909)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.16%
- **EPSS Percentile:** 5.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._