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CVE-2025-39933 is an input-validation vulnerability in the Linux kernel SMB client. The receive-completion processing in recv_done did not verify the SMB response fields data_offset, data_length, and remaining_data_length before using them. A malicious or malformed SMB server response could therefore cause incorrect parsing of received data. The fix adds validation of all three fields, following the approach used in related SMB server-side fixes.
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No public exploit code observed for this vulnerability.
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19 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel SMB client vulnerability involving insufficient verification of data_offset, data_length, and remaining_data_length in recv_done.
A Linux kernel SMB client vulnerability involving insufficient verification of data_offset, data_length, and remaining_data_length in recv_done.
A Linux kernel SMB client vulnerability involving insufficient verification of data_offset, data_length, and remaining_data_length in recv_done.
A Linux kernel SMB client vulnerability addressed by adding verification of data_offset, data_length, and remaining_data_length in recv_done.
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.