System hang via F2FS lock inversion
Published Mar 4, 2026 · Updated Mar 4, 2026
An F2FS deadlock in Linux kernel 6.19 allows local users to hang the system when file writes overlap a checkpoint-enable remount. A write path holds a page lock before taking cp_enable_rwsem for reading, while f2fs_enable_checkpoint holds that semaphore for writing and waits on the same page during writeback. Exploitation requires an F2FS filesystem and the concurrent write/remount sequence; the bounded consequence is a system hang, not data access or code execution.
Summary
What happened
An F2FS deadlock in Linux kernel 6.19 allows local users to hang the system when file writes overlap a checkpoint-enable remount. A write path holds a page lock before taking cp_enable_rwsem for reading, while f2fs_enable_checkpoint holds that semaphore for writing and waits on the same page during writeback. Exploitation requires an F2FS filesystem and the concurrent write/remount sequence; the bounded consequence is a system hang, not data access or code execution.
The record
- CVE
- CVE-2026-23232
- Published
- Mar 4, 2026
- Updated
- Mar 4, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-667, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 4, 2026CVE publishedPublication date reported by the CVE source.
- Mar 4, 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?
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- Affected versionversion=196c81fdd438f7ac429d5639090a9816abb9760a <3996b70209f145bfcf2afc7d05dd92c27b233b48
- Affected versionversion=196c81fdd438f7ac429d5639090a9816abb9760a <b6382273801bc7c778545dd8004c9a9d750b4f62
- Affected versionversion=6.19
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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Public exploit references
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Technologies
Your stack
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Your stack
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