Access-control bypass via omitted bind-mount permissions
Published Dec 24, 2025 · Updated Dec 24, 2025
Access-control bypass in Linux Landlock allows local users to widen filesystem rights through disconnected bind-mounted directories. The access collection in security/landlock/fs.c walks a disconnected filesystem hierarchy without incorporating the bind-mount point permissions. A confined task needs write and refer rights below the bind source plus read access at the mount point; exploitation can expose, modify, delete, or interrupt access to files allowed by underlying DAC.
Summary
What happened
Access-control bypass in Linux Landlock allows local users to widen filesystem rights through disconnected bind-mounted directories. The access collection in security/landlock/fs.c walks a disconnected filesystem hierarchy without incorporating the bind-mount point permissions. A confined task needs write and refer rights below the bind source plus read access at the mount point; exploitation can expose, modify, delete, or interrupt access to files allowed by underlying DAC.
The record
- CVE
- CVE-2025-68736
- Published
- Dec 24, 2025
- Updated
- Dec 24, 2025
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 24, 2025CVE publishedPublication date reported by the CVE source.
- Dec 24, 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=5.13
- Affected versionversion=cb2c7d1a1776057c9a1f48ed1250d85e94d4850d <49c9e09d961025b22e61ef9ad56aa1c21b6ce2f1
- Affected versionversion=cb2c7d1a1776057c9a1f48ed1250d85e94d4850d <cadb28f8b3fd6908e3051e86158c65c3a8e1c907
What conditions does exploitation require?
What is affected?
Published CVSS scores
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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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