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CVE PROGRAM SOURCE RECORD8.8 High

CVE-2026-31717

ksmbd: validate owner of durable handle on reconnect

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Status
Published
Published
Updated
Assigning organization
Linux

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).

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 8df4bcdb0a4232192b2445256c39b787d58ef14d to < 712cdf917e77a6444ce3836874829d770db20ee6affected
  • c8efcc786146a951091588e5fa7e3c754850cb3c to < c7f0f0d01c88bdcb8b1694d7d321670013f7ed7daffected
  • c8efcc786146a951091588e5fa7e3c754850cb3c to < 00ce8d6789dae72d042a4522264964c72891ca37affected
  • c8efcc786146a951091588e5fa7e3c754850cb3c to < c908c853f304a4969b5aa10eba0b50350cc65b80affected
  • c8efcc786146a951091588e5fa7e3c754850cb3c to < 49110a8ce654bbe56bef7c5e44cce31f4b102b8aaffected
  • 6.6.32 to < 6.6.142affected

Linux Linux

Default version status: affected

  • 6.9affected
  • 0 to < 6.9unaffected
  • 6.6.142 to ≤ 6.6.*unaffected
  • 6.12.92 to ≤ 6.12.*unaffected
  • 6.18.25 to ≤ 6.18.*unaffected
  • 7.0.2 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References