Advisory [CVE-2026-64392] use opener credentials for delete-on-close
This security Red Hat Linux advisory covers CVE-2026-64392.
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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. This vulnerability allows an attacker to bypass filesystem permission checks during 'delete-on-close' operations.
Specifically, when a file handle is torn down, the base-file unlink and extended attribute (xattr) removal operations incorrectly execute with ksmbd worker credentials instead of the original opener's credentials. This can lead to unauthorized deletion of files or removal of extended attributes, potentially compromising data integrity and availability.
Red Hat severity: not rated. Weakness: CWE-270.
Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 1 month ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 1 month ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 1 month ago·verify at source
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