CVE-2026-35339
In Chmoder::chmod() the recursive branch overwrites the running result instead of accumulating it, so the exit code reflects only the *last* file processed:
if self.recursive {
r = self.walk_dir_with_context(file, true); // overwrites r
} else {
r = self.chmod_file(file).and(r);
}
PoC: GNU returns 1 when a file fails; uutils returns 0 if the last entry succeeds:
$ chmod -R 0755 chmod-bug/root chmod-bug/user # GNU -> ret=1
$ uutils chmod -R 0755 chmod-bug/root chmod-bug/user # -> ret=0
Impact: scripts relying on the exit code get a false success signal while some files retained restrictive/unexpected permissions, leading to access-control misconfigurations. Recommendation: accumulate errors during traversal.
Remediation: Acknowledged by Canonical; fixed in commit abd581f6.
_Reported by Zellic in the *uutils coreutils Program Security Assessment* (prepared for Canonical, Jan 20 2026), audited commit 3a07ffc5a9bd4c283e75afa548ba1f1957bad242. Finding 3.2. Credit: Zellic._
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Exploitation outlook
- Low exploitation risk0.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all EPSS-scored CVEs.
Advisory coverage (1)
External references
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