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CVE-2025-21844 is a null-pointer dereference vulnerability in the Linux kernel SMB client’s encrypted-message receive path. The receive_encrypted_standard() function did not validate the return values of cifs_buf_get() and cifs_small_buf_get() before using next_buffer. If either buffer-allocation routine failed, next_buffer could be NULL and subsequently be dereferenced. The upstream fix validates allocation results before use.
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No public exploit code observed for this vulnerability.
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2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel SMB client encrypted-message buffer validation flaw.
A null-pointer-dereference vulnerability in the Linux kernel SMB/CIFS client’s receive_encrypted_standard() path, caused by failure to validate buffer-allocation return values from cifs_buf_get() and cifs_small_buf_get().
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.