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CVE-2025-21844 is a null pointer dereference vulnerability in the Linux kernel SMB client function receive_encrypted_standard(). The function failed to validate return values from cifs_buf_get() and cifs_small_buf_get() before using next_buffer. A failed buffer allocation can leave next_buffer null, resulting in a null pointer dereference.
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Linux kernel SMB client encrypted-buffer bounds validation flaw.
A Linux kernel SMB client null-pointer dereference flaw in receive_encrypted_standard() caused by unchecked return values from cifs_buf_get() and cifs_small_buf_get(), potentially causing denial of service.
A medium-severity Linux kernel SMB client null-pointer dereference vulnerability in receive_encrypted_standard(). Missing checks of cifs_buf_get() and cifs_small_buf_get() return values can cause an availability impact.
Linux kernel SMB client encrypted-message buffer validation flaw.
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.