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CVE-2021-47459 is a use-after-free vulnerability in the Linux kernel CAN J1939 subsystem involving j1939_netdev_start() and the rx_kref reference count of j1939_priv. Concurrent socket binding and network-device stop operations can allow one execution context to decrement rx_kref to zero before another increments it. Insufficient synchronization between the reference-count operations triggers a use-after-free warning. The fix protects the relevant kref_get() and kref_put() operations with j1939_netdev_lock.
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6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel CAN J1939 use-after-free involving rx_kref of j1939_priv in j1939_netdev_start(). Listed as fixed by the updated container image.
Use-after-free in Linux kernel CAN J1939 network-device startup.
Use-after-free vulnerability in the Linux kernel CAN J1939 subsystem.
Use-after-free vulnerability in the Linux kernel CAN J1939 networking subsystem.
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.