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CVE-2026-64379 is an input-validation vulnerability in the Linux kernel SMB client. When modefromsid is active, parse_dacl() applies the server-provided sub_auth[2] value from an NFS mode SID to cf_mode without masking it to 07777. Consequently, bits outside the intended permission-mode mask can be applied, potentially causing incorrect file permission handling. The fix masks the value to 07777, matching the existing read-path behavior.
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A server-provided mode handling vulnerability in the Linux kernel SMB client's modefromsid, addressed by masking the mode to 07777.
A vulnerability covered by the Miracle Linux kernel package update. Individual technical details and exploit availability are not specified.
A Linux kernel SMB client vulnerability caused by failing to mask server-provided file mode values to 07777 in the modefromsid path. The advisory rates it high severity, with a CVSS v3 base score of 7.1 and potential integrity and availability impacts. Fixed Google COS kernel packages are available in version 18867.528.43 or later.
Linux SMB client improper handling of server-provided mode values.
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Cross-references every affected SKU, including bundled OEM variants.
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