CVE-2026-35352

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.

Weakness classification

• security@ubuntu.com: CWE-367

Primary references

• security@ubuntu.com — Exploit, Issue Tracking, Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108
• af854a3a-2127-422b-91ae-364da2661108
• af854a3a-2127-422b-91ae-364da2661108
• 134c704f-9b21-4f2e-91b3-4a467353bcc0 — Exploit, Issue Tracking, Vendor Advisory