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Vulnerability record · CVE-2026-88924 · published 10 September 2026

CVE-2026-88924: TOCTOU race condition vulnerability

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.

7.0 CVSS 3.1 High EPSS 0.11% · top 98.7% CWE-367 · TOCTOU race condition Awaiting Analysis
7.0CVSS 3.1 base score
0.11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
11 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-88924), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.