High 8.8Published May 1, 2026

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

Updated under an hour ago (Oct 28, 2026, 9:50 PM ET)

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Exploited in the last 30 days

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: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 8df4bcdb0a4232192b2445256c39b787d58ef14d before 712cdf917e77a6444ce3836874829d770db20ee6; from c8efcc786146a951091588e5fa7e3c754850cb3c before c7f0f0d01c88bdcb8b1694d7d321670013f7ed7d; from c8efcc786146a951091588e5fa7e3c754850cb3c before 00ce8d6789dae72d042a4522264964c72891ca37; from c8efcc786146a951091588e5fa7e3c754850cb3c before c908c853f304a4969b5aa10eba0b50350cc65b80; from c8efcc786146a951091588e5fa7e3c754850cb3c before 49110a8ce654bbe56bef7c5e44cce31f4b102b8a; from 6.6.32 before 6.6.142	CNA record
linux linux_kernel linux:linux_kernel	from 6.6.32 before 6.7; from 6.9 before 6.18.25; from 6.19 before 7.0.2; 7.1	NVD

References

References

https://git.kernel.org/stable/c/712cdf917e77a6444ce3836874829d770db20ee6
https://git.kernel.org/stable/c/c7f0f0d01c88bdcb8b1694d7d321670013f7ed7d
https://git.kernel.org/stable/c/00ce8d6789dae72d042a4522264964c72891ca37	patch
https://git.kernel.org/stable/c/c908c853f304a4969b5aa10eba0b50350cc65b80	patch
https://git.kernel.org/stable/c/49110a8ce654bbe56bef7c5e44cce31f4b102b8a	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.