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CVE-2026-64379 is a Linux kernel SMB client vulnerability in the modefromsid handling path. When modefromsid is enabled, the SMB client function parse_dacl() copies the server-provided sub_auth[2] value from the NFS mode SID into cf_mode without masking it to 07777. This causes the client to trust and apply mode bits outside the expected Unix permission mask. The fix constrains the imported mode value with a 07777 mask, aligning this path with the existing read-path behavior. The flaw affects permission-mode handling rather than a memory-safety primitive.
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A Linux kernel SMB client vulnerability where server-provided mode bits from the NFS mode SID were applied without masking to 07777 in modefromsid, potentially resulting in incorrect file mode handling.
A Linux kernel SMB client vulnerability related to improper handling of server-provided mode values in modefromsid.
A specific vulnerability affecting Red Hat Enterprise Linux 10.2 kernel-related packages; the content does not provide technical details beyond listing it in the advisory.
A Linux kernel vulnerability in the SMB client related to masking server-provided mode to 07777 in modefromsid.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.