{"id":"CVE-2026-72172","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-72172","summary":"mm/mm_init: fix uninitialized struct pages for ZONE_DEVICE","details":"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.","published":"2026-08-15T05:53:37.795Z","modified":"2026-08-18T03:56:21.676323118Z","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.6.145"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/11f2826e9ee6f24aaa774e3dcd75abbe4b3091b6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/511a60e71aec308b24722cffc1912bf6befb87bf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b91e27bce37cab9f35de0059278ebe457ca9878b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cd681403a87085562499d60325b7b45d3be11217"},{"type":"WEB","url":"https://git.kernel.org/stable/c/da5234df0941665f3a3f5b80f3dab94046537be0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72172.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72172"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T03:56:21.676323118Z"}}