CVE-2026-64392
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 versions
Fixed in
6.6.145,
6.12.96,
6.18.39,
7.1.4,
7.2-rc1
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-64392?
CVE-2026-64392 is a unscored severity Linux kernel vulnerability . CVE-2026-64392 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-2026-64392?
Yes. CVE-2026-64392 has been patched. Fixed versions include 6.6.145, 6.12.96, 6.18.39 and others.
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Is CVE-2026-64392 actively exploited?
No. CVE-2026-64392 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.