Uutils coreutils Mkfifo Utility toctou

Summaryinfo

A vulnerability, which was classified as problematic, was found in Uutils coreutils. This vulnerability affects unknown code of the component Mkfifo Utility. Executing a manipulation can lead to toctou. This vulnerability is tracked as CVE-2026-35352. The attack is restricted to local execution. No exploit exists.

Detailsinfo

A vulnerability has been found in Uutils coreutils (affected version not known) and classified as problematic. This vulnerability affects some unknown functionality of the component Mkfifo Utility. The manipulation with an unknown input leads to a toctou vulnerability. The CWE definition for the vulnerability is CWE-367. The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was disclosed by Zellic. The advisory is shared for download at github.com. This vulnerability was named CVE-2026-35352 since 04/02/2026. The exploitation appears to be difficult. The attack needs to be approached locally. There are neither technical details nor an exploit publicly available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Uutils

Name

• coreutils

Website

• Product: https://github.com/uutils/coreutils/

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