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Vulnerability record · CVE-2026-35354 · published 22 April 2026

CVE-2026-35354: Uutils coreutils toctou race condition vulnerability

UUutils · Coreutils

A Time-of-Check to Time-of-Use (TOCTOU) vulnerability exists in the mv utility of uutils coreutils during cross-device moves. The extended attribute (xattr) preservation logic uses multiple path-based system calls that perform fresh path-to-inode lookups for each operation. A local attacker with write access to the directory can exploit this race to swap files between calls, causing the destination file to receive an inconsistent mix of security xattrs, such as SELinux labels or file capabilities.

4.7 CVSS 3.1 Medium EPSS 0.09% · top 99.5% CWE-367 · TOCTOU race condition
4.7CVSS 3.1 base score
0.09%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A Time-of-Check to Time-of-Use (TOCTOU) vulnerability exists in the mv utility of uutils coreutils during cross-device moves. The extended attribute (xattr) preservation logic uses multiple path-based system calls that perform fresh path-to-inode lookups for each operation. A local attacker with write access to the directory can exploit this race to swap files between calls, causing the destination file to receive an inconsistent mix of security xattrs, such as SELinux labels or file capabilities.

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

Affected products

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

References

LinkTags
https://github.com/uutils/coreutils/issues/10014 ExploitIssue TrackingVendor Advisory
https://github.com/uutils/coreutils/issues/10014 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%7.0CVE-2026-35352Uutils coreutils toctou race condition vulnerabilityA 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…EPSS 0.12%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%

Source: NIST National Vulnerability Database (record CVE-2026-35354), CISA KEV, FIRST EPSS (scores of 2026-10-03). This page is refreshed as NVD updates the record.