AIKIDO-2026-510590
coreutils is vulnerable to Improper Preservation of Permissions
33
CVE Score
Low
Improper Preservation of Permissions
TL;DR
When mv falls back to a cross-device copy (after rename(2) returns EXDEV), it best-effort preserves source ownership and then applies the full source mode, including setuid/setgid bits (0o6000). If ownership cannot be preserved — for example when an unprivileged user moves a root-owned setuid/setgid file across a filesystem boundary — the destination remains owned by the mover but still carries those bits. GNU mv and fixed uutils cp strip setuid/setgid in that case. The fix tracks whether ownership was actually preserved and masks 0o6000 from the applied mode when it was not.
How do I fix this?
Upgrade the coreutils library to the patch version.
Who does this affect?
You are affected if you are using a version within the vulnerable range and you run mv to move a setuid or setgid file across a filesystem boundary when the mover cannot preserve the source ownership.
Package
Versions
0.0.1 - 0.9.0
Fixed in 0.10.0Background info
coreutils is vulnerable to Improper Preservation of Permissions in versions 0.0.1 - 0.9.0.
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