Bug 2444388 (CVE-2026-23232)

Summary: CVE-2026-23232 kernel: Revert "f2fs: block cache/dio write during f2fs_enable_checkpoint()"
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2026-03-04 15:01:31 UTC 
In the Linux kernel, the following vulnerability has been resolved:

Revert "f2fs: block cache/dio write during f2fs_enable_checkpoint()"

This reverts commit 196c81fdd438f7ac429d5639090a9816abb9760a.

Original patch may cause below deadlock, revert it.

write				remount
- write_begin
 - lock_page  --- lock A
 - prepare_write_begin
  - f2fs_map_lock
				- f2fs_enable_checkpoint
				 - down_write(cp_enable_rwsem)  --- lock B
				 - sync_inode_sb
				  - writepages
				   - lock_page			--- lock A
   - down_read(cp_enable_rwsem)  --- lock A
Comment 1 Alexander B 2026-03-04 15:25:15 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026030439-CVE-2026-23232-b24d@gregkh/T