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Vulnerability record · CVE-2026-35352 · published 22 April 2026

CVE-2026-35352: Uutils coreutils toctou race condition vulnerability

UUutils · Coreutils

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.

7.0 CVSS 3.1 High EPSS 0.12% · top 98.4% CWE-367 · TOCTOU race condition
7.0CVSS 3.1 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/uutils/coreutils/issues/10020 ExploitIssue TrackingVendor Advisory
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 ExploitIssue TrackingVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.8CVE-2026-35368Uutils coreutils untrusted search path vulnerabilityA vulnerability exists in the chroot utility of uutils coreutils when using the --userspec option. The utility resolves the user specification via ge…EPSS 0.15%7.7CVE-2026-35349Uutils coreutils link following vulnerabilityA vulnerability in the rm utility of uutils coreutils allows a bypass of the --preserve-root protection. The implementation uses a path-string check …EPSS 0.21%7.3CVE-2026-35338Uutils coreutils path traversal vulnerabilityA vulnerability in the chmod utility of uutils coreutils allows users to bypass the --preserve-root safety mechanism. The implementation only validat…EPSS 0.20%7.1CVE-2026-35341Uutils coreutils incorrect permission assignment vulnerabilityA vulnerability in uutils coreutils mkfifo allows for the unauthorized modification of permissions on existing files. When mkfifo fails to create a F…EPSS 0.14%6.6CVE-2026-35365Uutils coreutils link following vulnerabilityThe mv utility in uutils coreutils improperly handles directory trees containing symbolic links during moves across filesystem boundaries. Instead of…EPSS 0.19%6.6CVE-2026-35350Uutils coreutils vulnerabilityThe cp utility in uutils coreutils fails to properly handle setuid and setgid bits when ownership preservation fails. When copying with the -p (prese…EPSS 0.13%6.3CVE-2026-35374Uutils coreutils toctou race condition vulnerabilityA Time-of-Check to Time-of-Use (TOCTOU) vulnerability exists in the split utility of uutils coreutils. The program attempts to prevent data loss by c…EPSS 0.09%6.3CVE-2026-35364Uutils coreutils toctou race condition vulnerabilityA Time-of-Check to Time-of-Use (TOCTOU) race condition exists in the mv utility of uutils coreutils during cross-device operations. The utility remov…EPSS 0.10%

Source: NIST National Vulnerability Database (record CVE-2026-35352), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.