CVE-2026-64393
Last modified
CVE-2026-64393 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: ksmbd: run set info with opener credentials SMB2 SET_INFO handlers call path-based VFS helpers after checking the access mask granted to the SMB handle. Those helpers perform their owner, inode permission and LSM checks using the current ksmbd worker credentials. Run the complete SET_INFO dispatch with the credentials captured when the handle was opened. EPSS estimates a 0.48% chance of exploitation in the next 30 days.
Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: run set info with opener credentials SMB2 SET_INFO handlers call path-based VFS helpers after checking the access mask granted to the SMB handle. Those helpers perform their owner, inode permission and LSM checks using the current ksmbd worker credentials. Run the complete SET_INFO dispatch with the credentials captured when the handle was opened. This also removes the separate security information credential setup and keeps all SET_INFO classes under one credential scope. Direct override_creds() is used because it can nest with the request credential overrides already used by rename and link helpers.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 5cbabf3a71575cd31bc7785d92d4ab42338a654b; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < b35afd5cf8fab236ef21117e42ee45691d4ffa7b; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 0ce682867fd506f61f40c76bde7e4205bde34e87; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 20ee516a62989a8d505ee432f9e59525ea23984e; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 8cc9ec711f5255167247a9ab6a7179b787426ed7; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < b383bcad3d2fe634b26efbce53e22bbb5753a520 |
| Linux | Linux | 5.15 |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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