EUVD-2026-75537
GHSA-8w8m-36rw-gg63
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access with a race condition (AC:H) required; low-privilege account is sufficient; once the race is won, full system compromise results.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Local privilege escalation in gvfs's privileged gvfsd-admin daemon affects Red Hat Enterprise Linux 6 through 10, allowing an authenticated local attacker to obtain root access. The daemon's use of symlink-following chown() on attacker-controlled directory paths creates a TOCTOU window during D-Bus socket setup. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) a local, authenticated user account with at minimum low-privilege access to the target system (PR:L per CVSS); (2) the gvfsd-admin daemon must be active, which occurs on systems running the GNOME desktop environment - headless or server RHEL installations without GNOME are not affected; (3) the attacker must control or influence a directory path that gvfsd-admin uses during D-Bus socket creation; (4) the attacker must successfully win a kernel-scheduler-dependent timing race, which is not guaranteed and may require many iterations, especially under low system load or with certain CPU scheduling policies (AC:H). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H accurately captures the risk profile: exploitation requires a local account (PR:L) and the ability to win a timing race (AC:H), but delivers complete system compromise (C:H/I:H/A:H) once successful. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-provided fix via standard RHEL package management (dnf update gvfs or yum update gvfs) once Red Hat publishes updated packages; monitor https://access.redhat.com/security/cve/CVE-2026-88924 for errata availability. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all RHEL 6-10 systems running gvfs and enumerate accounts with local shell access (SSH, console, or similar); flag systems with shared accounts or multiple users as highest priority. …
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