CVE-2026-31717 POC (Proof-of-Concept)

In the Linux kernel, the following vulnerability has been resolved:
ksmbd: validate owner of durable handle on reconnect
Currently, ksmbd does not verify if the user attempting to reconnect
to a durable handle is the same user who originally opened the file.
This allows any authenticated user to hijack an orphaned durable handle
by predicting or brute-forcing the persistent ID.
According to MS-SMB2, the server MUST verify that the SecurityContext
of the reconnect request matches the SecurityContext associated with
the existing open.
Add a durable_owner structure to ksmbd_file to store the original opener's
UID, GID, and account name. and catpure the owner information when a file
handle becomes orphaned. and implementing ksmbd_vfs_compare_durable_owner()
to validate the identity of the requester during SMB2_CREATE (DHnC).

Published: 2026-05-01

CVSS: 8.8

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Download CVE-2026-31717 POC (Proof-of-Concept) here:

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https://hokyo.gr/poc-54-cve-2026-31730/

https://hokyo.gr/poc-812-cve-2026-8137/

https://hokyo.gr/poc-780-cve-2026-7541/

https://hokyo.gr/poc-535-cve-2026-40562/