{"id":"CVE-2026-80685","summary":"mm/util: don't read __page_2 for order-1 folios in snapshot_page()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/util: don't read __page_2 for order-1 folios in snapshot_page()\n\nsnapshot_page() currently reads __page_2 after checking nr_pages \u003e 1, but\nit should only do so when nr_pages \u003e 2.\n\nIf an order-1 folio is allocated at the end of a vmemmap section,\n__page_2 will not exist and reading it will cause a fault.\n\nDuring DLPAR memory remove on a 22 TB ppc64le LPAR, snapshot_page() oopsed\non the page isolation path while reading an order-1 folio's __page_2 from\nan adjacent absent section (unmapped vmemmap).\n\nFix this to avoid reading memmap that doesn't exist (e.g., a vmemmap\nhole).","modified":"2026-08-31T03:30:29.434900650Z","published":"2026-08-28T06:52:51.305Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80685.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/7441d6348c70738e9ed307510db171c7a9b3f4bf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9668ffe0e2a5e2399dce281620198a2e415871fc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c649324571206a30949765320b91ccdb4c1722dc"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80685.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80685"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"31a31da8a6187f1e5448ec73222e01d7d3fed4aa"},{"fixed":"9668ffe0e2a5e2399dce281620198a2e415871fc"},{"fixed":"c649324571206a30949765320b91ccdb4c1722dc"},{"fixed":"7441d6348c70738e9ed307510db171c7a9b3f4bf"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80685.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.15.0"},{"fixed":"6.18.44"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80685.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"}]}