uutils coreutils has a Time-of-Check to Time-of-Use (TOCTOU) race condition
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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-35352US | — | — | ||
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 perm… | ||||
references
External citations — patches, advisories, analysis.
- http://www.openwall.com/lists/oss-security/2026/05/04/4WEB
- http://www.openwall.com/lists/oss-security/2026/05/04/5WEB
- http://www.openwall.com/lists/oss-security/2026/05/04/6WEB
- https://github.com/uutils/coreutilsPACKAGE
- https://github.com/uutils/coreutils/issues/10020WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-35352ADVISORY
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