Local root-directory access via incomplete chmod authorization
Published Jun 26, 2025 · Updated Nov 3, 2025
Improper privilege management in Ceph 17.2.7, 18.2.1 through 18.2.4, and 19.0.0 through 19.2.2 allows local users to access root-owned directories. Client::may_setattr checks only permission bits removed by a mode change, so adding read, write, and execute bits bypasses its owner check. An unprivileged local account must reach a ceph-fuse-mounted CephFS and issue chmod against a root-owned directory, after which its contents become readable, writable, and executable.
Summary
What happened
Improper privilege management in Ceph 17.2.7, 18.2.1 through 18.2.4, and 19.0.0 through 19.2.2 allows local users to access root-owned directories. Client::may_setattr checks only permission bits removed by a mode change, so adding read, write, and execute bits bypasses its owner check. An unprivileged local account must reach a ceph-fuse-mounted CephFS and issue chmod against a root-owned directory, after which its contents become readable, writable, and executable.
The record
- CVE
- CVE-2025-52555
- Published
- Jun 26, 2025
- Updated
- Nov 3, 2025
- Vendor
- Ceph
- Product
- Ceph
- Classifications
- CWE-269, T1068, T1222.002
- Attack vector
- adjacent
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 26, 2025CVE publishedPublication date reported by the CVE source.
- Nov 3, 2025Record 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== 17.2.7
- Affected versionversion=>= 18.2.1, < 18.2.5
- Affected versionversion=>= 19.0.0, < 19.2.3
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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