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 di…
Exact source revision recorded 30 Oct 2026 05:52:53 UTC. It does not establish the source's current position. Latest evidence.
euvd · EUVD-2026-24986
PublishedA 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.
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Original publisher date fields
datePublished: Apr 22, 2026, 4:08:07 PM
dateUpdated: May 4, 2026, 5:32:54 PM
- Source published
- Apr 22, 2026, 4:08:07 PM (timezone not stated)
- Source modified
- May 4, 2026, 5:32:54 PM (timezone not stated)
- Observed here
- 30 Oct 2026 05:52:53 UTC
- Source terms
- ENISA EUVD · source terms and attribution apply
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EUVD CVSS 3.1 · 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H