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THREAT OPS › Threat News › [NVD] CVE-2026-64392 (CRITICAL 9.1) — 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

[NVD] CVE-2026-64392 (CRITICAL 9.1) — 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

lownvdPublished 2026-07-25

CVE-2026-64392 CVSS: 9.1 CRITICAL Published: 2026-07-25T10:17:22.557

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 credential

MITRE ATT&CK techniques

CredentialsT1589.001

Indicators of compromise

CVE-2026-64392cve

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-64392