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CVE-2021-47492 is a Linux kernel transparent huge-page (THP) flaw in collapse_file. The function did not explicitly reject pages under writeback, relying instead on page-private handling and try_to_release_page(). That filtering is ineffective for XFS when its block size is equal to or larger than the page size because such pages have no page-private data. A THP collapse can therefore proceed on an XFS writeback page, leading to an invalid page state during XFS writeback completion and a kernel BUG or panic.
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What an attacker gets, and what they’ve been doing with it.
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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.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel memory-management/transparent huge pages flaw addressed by bailing out early in collapse_file when handling a writeback page.
A vulnerability addressed by the OpenShift Container Platform 4.12.65 security update; no technical details are provided in the advisory.
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.