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CVE-2021-4002 is a Linux kernel huge-page mapping flaw affecting Linux 3.6 and later. When a page of PMD mappings is unmapped by clearing a PUD entry, the kernel fails to perform the required TLB flush. Consequently, stale huge-page translations can remain usable. A local attacker can manipulate huge-page shared-memory mappings, including mappings created with SHM_HUGETLB or MAP_HUGETLB, to expose or corrupt data stored in hugetlbfs-backed huge pages.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
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.
Linux kernel vulnerability permitting possible disclosure or corruption of data on hugetlbfs.
Linux kernel vulnerability allowing potential data leakage or corruption on hugetlbfs.
Linux kernel hugetlbfs flaw that may leak or corrupt resident data.
Linux kernel flaw that may leak or corrupt data stored on hugetlbfs.
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.