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CVE-2021-47559 is a NULL-pointer dereference in the Linux kernel SMC networking subsystem's smc_vlan_by_tcpsk() function. The function's manual lower-network-device iteration could assign NULL after netdev_lower_get_next() returns no device, then pass the NULL pointer to is_vlan_dev(). The fix replaces the manual iteration with netdev_walk_all_lower_dev().
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No public exploit code observed for this vulnerability.
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3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel SMC networking flaw that can dereference a NULL pointer in smc_vlan_by_tcpsk().
Linux kernel SMC networking flaw that can cause a NULL-pointer dereference in smc_vlan_by_tcpsk().
A Linux kernel net/smc vulnerability involving a NULL-pointer dereference in smc_vlan_by_tcpsk(), which can cause a system crash or denial of service.
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.