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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).

PUBLISHED Reserved 2026-03-09 | Published 2026-05-01 | Updated 2026-05-03 | Assigner Linux




HIGH: 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Product status

Default status
unaffected

c8efcc786146a951091588e5fa7e3c754850cb3c (git) before 00ce8d6789dae72d042a4522264964c72891ca37
affected

c8efcc786146a951091588e5fa7e3c754850cb3c (git) before c908c853f304a4969b5aa10eba0b50350cc65b80
affected

c8efcc786146a951091588e5fa7e3c754850cb3c (git) before 49110a8ce654bbe56bef7c5e44cce31f4b102b8a
affected

8df4bcdb0a4232192b2445256c39b787d58ef14d (git)
affected

Default status
affected

6.9
affected

Any version before 6.9
unaffected

6.18.25 (semver)
unaffected

7.0.2 (semver)
unaffected

7.1-rc1 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/00ce8d6789dae72d042a4522264964c72891ca37

git.kernel.org/...c/c908c853f304a4969b5aa10eba0b50350cc65b80

git.kernel.org/...c/49110a8ce654bbe56bef7c5e44cce31f4b102b8a

cve.org (CVE-2026-31717)

nvd.nist.gov (CVE-2026-31717)

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