Local authorization bypass via missing backing-file checks
Published May 27, 2026 · Updated Aug 26, 2026
Authorization bypass in Linux kernel SELinux OverlayFS handling allows local users to access protected backing files through mmap or mprotect. The mapping paths validate the visible upper file but omit required SELinux checks against the backing file and its mounter credentials. Exploitation requires local low-privileged access and an OverlayFS configuration, permitting unauthorized file access or modification within that filesystem.
Summary
What happened
Authorization bypass in Linux kernel SELinux OverlayFS handling allows local users to access protected backing files through mmap or mprotect. The mapping paths validate the visible upper file but omit required SELinux checks against the backing file and its mounter credentials. Exploitation requires local low-privileged access and an OverlayFS configuration, permitting unauthorized file access or modification within that filesystem.
The record
- CVE
- CVE-2026-46054
- Published
- May 27, 2026
- Updated
- Aug 26, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
- Classifications
- CWE-280, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 27, 2026CVE publishedPublication date reported by the CVE source.
- Aug 26, 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?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
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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