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CVE-2025-39933 is an improper input-validation vulnerability in the Linux kernel SMB client. The SMB receive-completion path, recv_done, did not verify the data_offset, data_length, and remaining_data_length fields before processing an SMB response. The correction adds validation of these response-length and offset values, preventing malformed SMB protocol data from being processed with inconsistent bounds.
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No public exploit code observed for this vulnerability.
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20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Unity Linux vulnerability with local attack vector, low attack complexity, low privileges required, and high impact to availability; the content provides no further technical flaw description.
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.
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.