Vulnerability · Published Apr 22, 2026 · Assigned by canonical
CVE-2026-35352uutils coreutils mkfifo Privilege Escalation via TOCTOU Race Condition
High 7.0
In plain English
A high-severity security flaw in coreutils from Uutils. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | rust-coreutils | no fix listed | DEBIAN-CVE-2026-35352 |
| Debian:13 | rust-coreutils | no fix listed | DEBIAN-CVE-2026-35352 |
| Debian:14 | rust-coreutils | 0.10.0-1 | DEBIAN-CVE-2026-35352 |
| Ubuntu:24.04:LTS | rust-coreutils | no fix listed | UBUNTU-CVE-2026-35352 |
| Ubuntu:25.10 | rust-coreutils | no fix listed | UBUNTU-CVE-2026-35352 |
| Ubuntu:26.04:LTS | rust-coreutils | no fix listed | UBUNTU-CVE-2026-35352 |
| Ubuntu:26.10 | rust-coreutils | no fix listed | UBUNTU-CVE-2026-35352 |
Affected products (as reported)
Weakness: CWE-367 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H