CVE-2026-64392

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf44158485826c076335d6860d35872271a83791d < f08b3f451f12eee4abd8a5981803bc36db84458baffected
LinuxLinuxf44158485826c076335d6860d35872271a83791d < 18c59109bb6fb816d5102171666f87cf1e29901daffected
LinuxLinuxf44158485826c076335d6860d35872271a83791d < e72c15085b6d86f45d224d98aa75b5cace4aaab9affected
LinuxLinuxf44158485826c076335d6860d35872271a83791d < 4b7059974549d278e30fe70e2a4e421f9839817daffected
LinuxLinuxf44158485826c076335d6860d35872271a83791d < 52e2f21911158ec961cd5aae19c56460db382af0affected
LinuxLinux5.15affected
LinuxLinux0 < 5.15unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.96 <= 6.12.*unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References