CVE-2025-37952

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.

This vulnerability does not affect Red Hat Enterprise Linux or other supported products because the in-kernel SMB server (ksmbd) is neither enabled nor built into Red Hat enterprise kernels. Red Hat provides file sharing services through user-space Samba implementations rather than the kernel-space ksmbd module. Consequently, systems running supported Red Hat kernels do not carry the vulnerable code and are not exposed to this race condition.