CVE-2026-64392
CVE-2026-64392: 1 tracked advisory record across Red Hat. Compare source-reported impact, fixes and remediation.
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Red Hat
1 advisory- Advisory severityUnrated
Advisory [CVE-2026-64392] use opener credentials for delete-on-close
CVE-2026-64392Source published Source updated
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…
- Affected products in this advisory
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- Source-reported affected versions
- Affected-version details not available in this record.
- Source-reported fixed versions
- No fixed-version detail extracted. This does not mean no fix exists.
- Mitigation guidance
- No mitigation guidance extracted; consult the source.
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