What’s Vulnerable › Vulnerabilities

CVE-2026-35352: uutils coreutils mkfifo Privilege Escalation via TOCTOU Race Condition

• Severity: high (CVSS 7.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-22 · updated 2026-10-26
• Weakness: CWE-367

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 products

• Uutils coreutils: all versions

References

• https://github.com/uutils/coreutils/issues/10020
• http://www.openwall.com/lists/oss-security/2026/05/04/4
• http://www.openwall.com/lists/oss-security/2026/05/04/5
• http://www.openwall.com/lists/oss-security/2026/05/04/6
• https://github.com/uutils/coreutils/issues/10020

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