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CVE-2021-47018 is a Linux kernel flaw affecting the PowerPC 64-bit architecture. The kernel defined the fixmap area at the top of the virtual address space, or immediately below the KASAN region, a layout that is invalid on PPC64. The upstream correction instead reserves a fixed-size fixmap area at the top of the I/O address space and includes a build-time check that the reserved area is sufficiently large.
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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.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel fixmap-area bounds issue.
A low-severity Linux kernel flaw affecting the PPC64 fixmap-area definition. Invalid fixmap bounds could lead to an availability impact; Red Hat rates the issue CVSS 3.2, while NVD rates it 5.5.
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.