CVE-2026-31717 - ksmbd: validate owner of durable handle on reconnect

CVE-2026-31717 - ksmbd: validate owner of durable handle on reconnect

https://cvefeed.io/rssfeed/latest.atom / Fri, 05/01/2026 - 17:21
CVE ID :CVE-2026-31717
Published : May 1, 2026, 1:56 p.m. | 19 minutes ago
Description :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).
Severity: 0.0 | NA
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