Vulnerability 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).
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.6.32, < 6.7 |
References
- https://git.kernel.org/stable/c/00ce8d6789dae72d042a4522264964c72891ca37Patch
- https://git.kernel.org/stable/c/49110a8ce654bbe56bef7c5e44cce31f4b102b8aPatch
- https://git.kernel.org/stable/c/c908c853f304a4969b5aa10eba0b50350cc65b80Patch
FAQ
What is CVE-2026-31717?
CVE-2026-31717 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 dur...
How severe is CVE-2026-31717?
CVE-2026-31717 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31717?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.