A flaw was found in the admin backend of gvfs.
CVE-2026-88924
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.
Assessment
- CVSS
- 7 (v3.1)
- Severity
- High
- EPSS
- 0.22% chance of exploitation in the next 30 days
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 10 September 2026
- Last updated
- 4 November 2026
- Affected
- Gnome · Red Hat · Red Hat Enterprise Linux 10 · Red Hat Enterprise Linux 10.0 Extended Update Support · Red Hat Enterprise Linux 9 · Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
- Assigner
- redhat
CVSS vectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
At the source
References
- https://access.redhat.com/errata/RHSA-2026:73998
- https://access.redhat.com/errata/RHSA-2026:74370
- https://access.redhat.com/errata/RHSA-2026:85939
- https://access.redhat.com/errata/RHSA-2026:85941
- https://access.redhat.com/errata/RHSA-2026:85942
- https://access.redhat.com/errata/RHSA-2026:85944
- 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
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