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CVE-2021-47606 is a denial-of-service vulnerability in the Linux kernel netlink subsystem's af_netlink implementation. af_netlink could permit an empty socket buffer (skb), with both skb->len and skb->data_len equal to zero, to reach packet processing. When such a buffer is enqueued through the netem traffic-control queue discipline with randomized packet corruption enabled, netem_enqueue computes a random offset modulo skb_headlen(skb). A zero head length causes a divide-by-zero exception and kernel crash. The upstream fix validates the netlink message length to prevent creation or processing of an empty skb.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel Netlink flaw caused by insufficient validation that can permit an empty skb.
A resolved Linux kernel netlink/af_netlink flaw involving creation or handling of an empty socket buffer (skb); the fix adds a length check to prevent an empty skb.
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.