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CVE-2021-47118 is a use-after-free vulnerability in Linux kernel PID handling. During boot, kernel_init_freeable() assigns the init task's struct pid to cad_pid without acquiring a reference. When cad_pid is subsequently changed through its sysctl handler, proc_do_cad_pid() acquires a reference to the replacement PID and releases the old PID. This releases a reference that was never acquired for the initial cad_pid assignment, potentially freeing the init task's struct pid while dangling references remain. Subsequent PID namespace or signal-delivery processing can dereference the freed object.
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No public exploit code observed for this vulnerability.
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6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel process-ID reference-management flaw involving cad_pid initialization.
Linux kernel PID reference-management vulnerability during cad_pid initialization.
Linux kernel CAD PID reference-management vulnerability.
Linux kernel PID reference-management vulnerability involving cad_pid initialization.
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.