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CVE-2021-47560 is a NULL pointer dereference in the Linux kernel Mellanox mlxsw Spectrum driver. While handling firmware-generated port link-state events, the driver rejected non-existent local ports but did not exclude the CPU port (local port 0). Although that port exists, it has no associated network-device object. A port-up or port-down event for the CPU port can therefore cause the driver to pass a NULL network-device pointer to carrier-state handling, resulting in a kernel NULL pointer dereference. The upstream fix exits event processing early when the event identifies the CPU port. The flaw was introduced in Linux kernel 5.4 and fixed upstream in 5.10.83, 5.15.6, and 5.16.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Unknown.
Linux kernel mlxsw Spectrum driver vulnerability related to protection against malformed or buggy firmware behavior.
Linux kernel mlxsw Spectrum driver robustness flaw.
A Linux kernel mlxsw Spectrum driver vulnerability related to protecting the driver from buggy firmware.
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.