Local data exposure via non-atomic directory modes
Published Apr 22, 2026 · Updated Apr 22, 2026
TOCTOU race in uutils coreutils before 0.6.0 allows local users to read data through briefly permissive mkdir -m directories. The mkdir utility first creates the directory with umask-derived permissions, often 0755, and only afterward applies the requested mode with chmod. Exploitation requires another local user to win the short interval before chmod; the bounded consequence is access to data placed in a directory intended to be private.
Summary
What happened
TOCTOU race in uutils coreutils before 0.6.0 allows local users to read data through briefly permissive mkdir -m directories. The mkdir utility first creates the directory with umask-derived permissions, often 0755, and only afterward applies the requested mode with chmod. Exploitation requires another local user to win the short interval before chmod; the bounded consequence is access to data placed in a directory intended to be private.
The record
- CVE
- CVE-2026-35353
- Published
- Apr 22, 2026
- Updated
- Apr 22, 2026
- Vendor
- uutils
- Product
- coreutils
- Classifications
- CWE-367, T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 22, 2026CVE publishedPublication date reported by the CVE source.
- Apr 22, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <0.6.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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