Bug 2367574 (CVE-2025-37952)

Summary: CVE-2025-37952 kernel: ksmbd: Fix UAF in __close_file_table_ids
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-05-20 17:01:35 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ksmbd: Fix UAF in __close_file_table_ids

A use-after-free is possible if one thread destroys the file
via __ksmbd_close_fd while another thread holds a reference to
it. The existing checks on fp->refcount are not sufficient to
prevent this.

The fix takes ft->lock around the section which removes the
file from the file table. This prevents two threads acquiring the
same file pointer via __close_file_table_ids, as well as the other
functions which retrieve a file from the IDR and which already use
this same lock.
Comment 1 Avinash Hanwate 2025-05-21 06:49:16 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025052001-CVE-2025-37952-299d@gregkh/T