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CVE-2025-40240 is a NULL-pointer dereference vulnerability in the Linux kernel Stream Control Transmission Protocol (SCTP) subsystem. SCTP processing dereferences the chunk->skb pointer in a code path in which it can be NULL when a chunk data buffer is missing. The corrective change tests frag_list immediately before replacing chunk->skb, rather than testing the pointer in the erroneous condition.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
29 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Referenced as affecting packages covered by the TuxCare CentOS Linux 8.5 advisory; no technical vulnerability details are provided.
A Linux kernel SCTP vulnerability involving a NULL dereference when a chunk data buffer is missing.
A Linux kernel SCTP vulnerability involving a NULL dereference when a chunk data buffer is missing.
A Linux kernel NULL dereference vulnerability in SCTP when a chunk data buffer is missing.
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.