CVE-2026-64393
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 versions
Fixed in
6.1.178,
6.6.145,
6.12.96,
6.18.39,
7.1.4,
7.2-rc1
and their respective stable series.
References
6 totalFrequently asked questions
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What is CVE-2026-64393?
CVE-2026-64393 is a unscored severity Linux kernel vulnerability . CVE-2026-64393 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-64393?
Yes. CVE-2026-64393 has been patched. Fixed versions include 6.1.178, 6.6.145, 6.12.96 and others.
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Is CVE-2026-64393 actively exploited?
No. CVE-2026-64393 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.