CVE-2026-35354: uutils coreutils mv Security Xattr TOCTOU Race in Cross-Device
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-35354?
CVE-2026-35354 is classified as a medium severity vulnerability due to the potential for a time-of-check to time-of-use (TOCTOU) race condition.
How do I fix CVE-2026-35354?
To mitigate CVE-2026-35354, ensure you use the latest version of uutils coreutils where this vulnerability is patched.
What affects CVE-2026-35354?
CVE-2026-35354 affects the mv utility within uutils coreutils during cross-device file moves.
What is the impact of CVE-2026-35354?
The impact of CVE-2026-35354 is the potential modification or loss of extended attributes of files during the move process.
Is CVE-2026-35354 exploitable remotely?
CVE-2026-35354 is not considered remotely exploitable as it requires local access to perform the vulnerable operation.