# CVE-2026-88924

## Summary

- **CVE ID:** CVE-2026-88924
- **Severity:** HIGH
- **CVSS Score:** 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-367
- **Published:** Sep 10, 2026
- **Last Modified:** Sep 10, 2026

## Description

A flaw was found in the admin backend of gvfs. The privileged gvfsd-admin daemon changes the ownership of newly created private D-Bus sockets by calling the link-following chown() function on a pathname inside a user-controlled directory. A local attacker can exploit this via a Time-of-Check Time-of-Use (TOCTOU) race condition and exchange the socket pathname with a symbolic link pointing to an arbitrary root-owned file (such as /etc/pam.d/su). The daemon subsequently follows the symlink and changes the ownership of the targeted root-owned file to the attacker's user ID. This allows an authenticated local attacker to modify critical system files, leading to a full local privilege escalation to root.

## Affected Products

No affected products listed.

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-88924)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2531456)
- [CNA](https://gitlab.gnome.org/GNOME/gvfs/-/issues/875)

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._