# CVE-2026-88924: GNOME gvfs privilege escalation via symlink TOCTOU in admin daemon

Source: https://junglewise.ai/threats/cve-2026-88924-gnome-gvfs-privilege-escalation-via-symlink-toctou-in-admin  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-10. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-88924 · Severity: high · CVSS 7 · Published 2026-09-10

GNOME gvfs is a virtual filesystem implementation used by Linux desktop environments to manage file access and storage. A flaw in the privileged gvfsd-admin daemon allows a local attacker to change ownership of critical system files through a race condition, leading to full root-level compromise. An authenticated attacker can exploit this to modify system configuration files and gain administrative control over the system.

Technologies: [Gnome Gvfs](https://junglewise.ai/threats/technologies/gvfs). Vendors: [Gnome](https://junglewise.ai/threats/vendors/gnome).

## Quick answers

**Is CVE-2026-88924 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-88924 being exploited in the wild.

**How severe is CVE-2026-88924?** High severity, with a CVSS score of 7, published 10 September 2026.

**Which products and versions are affected?** GNOME gvfs.

**Is there a fix for CVE-2026-88924?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-88924 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-88924?** Check whether you run Gnome Gvfs. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a Time-of-Check Time-of-Use (TOCTOU) race condition in the gvfsd-admin daemon's handling of D-Bus socket ownership. The daemon uses the link-following chown() function on a pathname inside a user-controlled directory without proper synchronization. An attacker can replace the socket pathname with a symbolic link pointing to an arbitrary root-owned file (such as /etc/pam.d/su) between the permission check and the chown operation. The daemon follows the symlink and changes the target file's ownership to the attacker's user ID, enabling modification of critical system files. The attack requires local authentication and a precise timing window but results in privilege escalation to root.

## Affected products

- GNOME gvfs

## Timeline

- 2026-09-10: disclosed

## References

- [https://gitlab.gnome.org/GNOME/gvfs](https://gitlab.gnome.org/GNOME/gvfs)
- [https://access.redhat.com/downloads/content/package-browser/](https://access.redhat.com/downloads/content/package-browser/)

## Related threats

- [GNOME gvfs buffer overflow in MTP backend](https://junglewise.ai/threats/cve-2026-84270-gnome-gvfs-buffer-overflow-in-mtp-backend)
- [GNOME gvfs AFP backend heap buffer overflow](https://junglewise.ai/threats/cve-2026-84269-gnome-gvfs-afp-backend-heap-buffer-overflow)
- [GNOME gvfs SFTP backend heap overflow](https://junglewise.ai/threats/cve-2026-84268-gnome-gvfs-sftp-backend-heap-overflow)
- [GNOME gvfs SFTP buffer read vulnerability](https://junglewise.ai/threats/cve-2026-84267-gnome-gvfs-sftp-buffer-read-vulnerability)