https://seclists.org/oss-sec/2026/q2/374: uutils coutils CVEs
Published May 4, 2026
·Updated
Affected Software
1 affected component
uutils uutils coreutils mkfifo
Frequently Asked Questions
1
Who can take advantage of the observed permission window?
Another local user may be able to open the FIFO after it is created and before the subsequent chmod call restricts its permissions. The example shows the FIFO initially created with mode 0666 before being changed to 0700.
2
Does the reported symbolic-link swap apply to FIFOs created in /tmp?
The notice states that this attack does not work in /tmp because the sticky bit prevents it. The message distinguishes this claimed symlink issue from the separately observed window in which the FIFO is temporarily world-readable and world-writable.
3
How can I check whether a deployment exhibits the temporary permissive creation mode?
Trace mkfifo and inspect the creation and permission-setting calls. In the supplied example, mknodat creates the FIFO with S_IFIFO|0666 and a later path-based chmod changes it to 0700.