{"id":"CVE-2026-72172","revision":null,"records":[{"revision":"e88238d4f8e1445999eab6e4b398a2b4","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-72172","aliases":[],"title":"mm/mm_init: fix uninitialized struct pages for ZONE_DEVICE","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/mm_init: fix uninitialized struct pages for ZONE_DEVICE\n\nIf DAX memory is hotplugged into an unoccupied subsection of an early\nsection, section_activate() reuses the unoptimized boot memmap. However,\ncompound_nr_pages() still assumes that vmemmap optimization is in effect\nand initializes only the reduced number of struct pages. As a result, the\nremaining tail struct pages are left uninitialized, which can later lead\nto unexpected behavior or crashes.\n\nFix this by treating early sections as unoptimized when calculating how\nmany struct pages to initialize.","state":0,"publishedAt":"2026-08-15T05:53:37.795+00:00","modifiedAt":"2026-10-16T18:45:00.307+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"mm/mm_init.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6fd3620b342861de9547ea01d28f664892ef51a1\",\n \"lessThan\": \"c5ef574d57e4a701485c13f26822328c91f05413\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6fd3620b342861de9547ea01d28f664892ef51a1\",\n \"lessThan\": \"511a60e71aec308b24722cffc1912bf6befb87bf\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6fd3620b342861de9547ea01d28f664892ef51a1\",\n \"lessThan\": \"11f2826e9ee6f24aaa774e3dcd75abbe4b3091b6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6fd3620b342861de9547ea01d28f664892ef51a1\",\n \"lessThan\": \"da5234df0941665f3a3f5b80f3dab94046537be0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6fd3620b342861de9547ea01d28f664892ef51a1\",\n \"lessThan\": \"b91e27bce37cab9f35de0059278ebe457ca9878b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6fd3620b342861de9547ea01d28f664892ef51a1\",\n \"lessThan\": \"cd681403a87085562499d60325b7b45d3be11217\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"mm/mm_init.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.19\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.19\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.184\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.145\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.97\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.40\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.5\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/c5ef574d57e4a701485c13f26822328c91f05413","https://git.kernel.org/stable/c/511a60e71aec308b24722cffc1912bf6befb87bf","https://git.kernel.org/stable/c/11f2826e9ee6f24aaa774e3dcd75abbe4b3091b6","https://git.kernel.org/stable/c/da5234df0941665f3a3f5b80f3dab94046537be0","https://git.kernel.org/stable/c/b91e27bce37cab9f35de0059278ebe457ca9878b","https://git.kernel.org/stable/c/cd681403a87085562499d60325b7b45d3be11217"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72172","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-72172","identifiers":["CVE-2026-72172"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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