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CVE-2021-47566 is a flaw in the Linux kernel proc/vmcore read path. The code cleared a user-space buffer using memset rather than the user-access-aware clear_user() helper. On x86-64 systems with Supervisor Mode Access Prevention (SMAP), this can cause a supervisor-mode page fault because the required user-access handling is absent. The issue is reproducible while reading a vmcore when a virtio-mem device has registered a vmcore callback and logically unplugged memory lies within an added Linux memory block.
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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.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Improper user-buffer clearing in Linux proc/vmcore.
Linux kernel proc/vmcore issue caused by improper clearing of a user buffer.
A resolved Linux kernel proc/vmcore issue involving improper clearing of a user buffer; the fix uses clear_user() correctly.
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.