Bug 2395341 (CVE-2023-53163)

Summary: CVE-2023-53163 kernel: fs/ntfs3: don't hold ni_lock when calling truncate_setsize()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-09-15 15:08:32 UTC 
In the Linux kernel, the following vulnerability has been resolved:

fs/ntfs3: don't hold ni_lock when calling truncate_setsize()

syzbot is reporting hung task at do_user_addr_fault() [1], for there is
a silent deadlock between PG_locked bit and ni_lock lock.

Since filemap_update_page() calls filemap_read_folio() after calling
folio_trylock() which will set PG_locked bit, ntfs_truncate() must not
call truncate_setsize() which will wait for PG_locked bit to be cleared
when holding ni_lock lock.
Comment 1 Jon Moroney 2025-09-15 21:04:24 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091553-CVE-2023-53163-860f@gregkh/T