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CVE-2026-88924: Gvfs: gvfs-admin socket ownership race permits local root

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

How to fix

Upgrade to a fixed version: GNOME gvfs 1.58.5, 1.60.3, 1.62.0; Red Hat Enterprise Linux 10 0:1.54.4-4.el10_2.1; Red Hat Enterprise Linux 10.0 Extended Update Support 0:1.54.4-2.el10_0.2; Red Hat Enterprise Linux 9 0:1.48.1-8.el9_8.1; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:1.48.1-4.el9_2.1; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:1.48.1-4.el9_4.1; Red Hat Enterprise Linux 9.6 Extended Update Support 0:1.48.1-6.el9_6.1. Check the vendor advisory for mitigations.

References

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