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CVE-2024-40914 is a reference-counting flaw in the Linux kernel's huge-memory management. The HWPoison flag can be set on huge_zero_folio without incrementing its reference count. Subsequently, unpoison_memory() treats the folio as successfully hardware-poisoned and unexpectedly decrements its reference count. Releasing the folio can then trigger VM_BUG_ON_PAGE(page_ref_count(page) == 0), causing a kernel panic in shrink_huge_zero_page_scan(). The failure was observed during memory-failure testing.
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A Linux kernel memory-management vulnerability in which unpoisoning huge_zero_folio incorrectly decreases its reference count, triggering a kernel panic when the folio is released. The advisory rates it medium severity, with CVSS v3 5.5 and a local, low-privilege attack vector affecting availability. The fix skips unpoisoning huge_zero_folio.
Linux kernel vulnerability covered by the security update.
Linux kernel huge-memory handling flaw involving huge zero folios.
Linux kernel huge-memory incorrect unpoisoning flaw involving huge_zero_folio.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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