A Time-of-Check to Time-of-Use (TOCTOU) race condition exists in the mkfifo utility of uutils coreutils. The utility creates a FIFO and then performs a path-based chmod to set permissions. A local attacker with write access to the parent directory can swap the newly created FIFO for a symbolic link between these two operations. This redirects the chmod call to an arbitrary file, potentially enabling privilege escalation if the utility is run with elevated privileges.
History

Fri, 24 Apr 2026 19:15:00 +0000

Type Values Removed Values Added
First Time appeared Uutils
Uutils coreutils
CPEs cpe:2.3:a:uutils:coreutils:-:*:*:*:*:rust:*:*
Vendors & Products Uutils
Uutils coreutils

Fri, 24 Apr 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 22 Apr 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 22 Apr 2026 16:30:00 +0000

Type Values Removed Values Added
Description A Time-of-Check to Time-of-Use (TOCTOU) race condition exists in the mkfifo utility of uutils coreutils. The utility creates a FIFO and then performs a path-based chmod to set permissions. A local attacker with write access to the parent directory can swap the newly created FIFO for a symbolic link between these two operations. This redirects the chmod call to an arbitrary file, potentially enabling privilege escalation if the utility is run with elevated privileges.
Title uutils coreutils mkfifo Privilege Escalation via TOCTOU Race Condition
Weaknesses CWE-367
References
Metrics cvssV3_1

{'score': 7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: canonical

Published: 2026-04-22T16:08:07.422Z

Updated: 2026-04-24T13:42:55.541Z

Reserved: 2026-04-02T12:58:56.087Z

Link: CVE-2026-35352

cve-icon Vulnrichment

Updated: 2026-04-22T18:03:30.321Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-22T17:16:37.597

Modified: 2026-04-24T19:03:53.083

Link: CVE-2026-35352

cve-icon Redhat

No data.