CVE-2026-64392
Last modified
CVE-2026-64392 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: ksmbd: use opener credentials for delete-on-close Delete-on-close can be completed by deferred or durable handle teardown, where no request work is available. Both the base-file unlink and the ADS xattr removal consequently run with the ksmbd worker credentials and can bypass filesystem permission checks. Run both operations with the credentials captured in struct file when the handle was opened. EPSS estimates a 0.47% chance of exploitation in the next 30 days.
Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: use opener credentials for delete-on-close Delete-on-close can be completed by deferred or durable handle teardown, where no request work is available. Both the base-file unlink and the ADS xattr removal consequently run with the ksmbd worker credentials and can bypass filesystem permission checks. Run both operations with the credentials captured in struct file when the handle was opened. This preserves the authenticated user's fsuid, fsgid, supplementary groups and capability restrictions at final close.
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 | >= f44158485826c076335d6860d35872271a83791d, < f08b3f451f12eee4abd8a5981803bc36db84458b; >= f44158485826c076335d6860d35872271a83791d, < 18c59109bb6fb816d5102171666f87cf1e29901d; >= f44158485826c076335d6860d35872271a83791d, < e72c15085b6d86f45d224d98aa75b5cace4aaab9; >= f44158485826c076335d6860d35872271a83791d, < 4b7059974549d278e30fe70e2a4e421f9839817d; >= f44158485826c076335d6860d35872271a83791d, < 52e2f21911158ec961cd5aae19c56460db382af0 |
| 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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