CVE-2026-64393

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 5cbabf3a71575cd31bc7785d92d4ab42338a654baffected
LinuxLinuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < b35afd5cf8fab236ef21117e42ee45691d4ffa7baffected
LinuxLinuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 0ce682867fd506f61f40c76bde7e4205bde34e87affected
LinuxLinuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 20ee516a62989a8d505ee432f9e59525ea23984eaffected
LinuxLinuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 8cc9ec711f5255167247a9ab6a7179b787426ed7affected
LinuxLinuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < b383bcad3d2fe634b26efbce53e22bbb5753a520affected
LinuxLinux5.15affected
LinuxLinux0 < 5.15unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
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