23 Oct 2026 15:48:27 UTC
mm/util: don't read __page_2 for order-1 folios in snapshot_page()
cve-program · CVE-2026-80685 · Published
CVE-2026-80685
mm/util: don't read __page_2 for order-1 folios in snapshot_page()
CVSS 3.1 7.1 HIGHCheck source for fixed versionsKEV status unknown
cve-program · CVE-2026-80685
PublishedIn the Linux kernel, the following vulnerability has been resolved: mm/util: don't read __page_2 for order-1 folios in snapshot_page() snapshot_page() currently reads __page_2 after checking nr_pages > 1, but it should only do so when nr_pages > 2. If an order-1 folio is allocated at the end of a vmemmap section, __page_2 will not exist and reading it will cause a fault. During DLPAR memory remove on a 22 TB ppc64le LPAR, snapshot_page() oopsed on the page isolation path while reading an order-1 folio's __page_2 from an adjacent absent section (unmapped vmemmap). Fix this to avoid reading memmap that doesn't exist (e.g., a vmemmap hole).
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