Description
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.
Affected products
linux: linux kernel
References5
- git.kernel.org/stable/c/16727e442568a46d9cca69fe2595896de86e120d Patch
- git.kernel.org/stable/c/36991c1ccde2d5a521577c448ffe07fcccfe104d Patch
- git.kernel.org/stable/c/9e9841e232b51171ddf3bc4ee517d5d28dc8cad6 Patch
- git.kernel.org/stable/c/fec1f9e9a650e8e7011330a085c77e7bf2a08ea9 Patch
- git.kernel.org/stable/c/21100812657965dd95bc305f6076f62012f34cf4
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 31 · as of 7 November 2026
- CWE
- CWE-416
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