{"id":"CVE-2026-93172","summary":"mm/mm_init: handle alloc_percpu failure in free_area_init_core_hotplug","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/mm_init: handle alloc_percpu failure in free_area_init_core_hotplug\n\nWe miss a failed allocation check for pgdat-\u003eper_cpu_nodestats, which\nresults in a NULL deref when we offset into the per-cpu area.\n\nPropagate -ENOMEM up the stack and leave per_cpu_nodestats pointing\nat boot_nodestats so a later online can retry the allocation.\n\nhotadd_init_pgdat() returns NULL on failure, which __try_online_node()\nalready maps to -ENOMEM.\n\nOn failure nothing needs to be unwound:\n  - the node is never marked online\n  - per_cpu_nodestats is left pointing at boot_nodestats\n  - __add_memory_resource() cleans up pending memblock resources\n  - later online attempts retry the per_cpu_nodestats allocation","modified":"2026-09-19T03:47:22.757559711Z","published":"2026-09-17T16:12:02.544Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93172.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1017fe1c7f48e511c5a680e3057005daaff2f3a2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2ebce860bdd7ae5e13002811bc9bbbf33fcfc221"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4cc5caef9a8d1894dfa31d84a0daa0ac1437dadc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bc3b5e6519b8df22d622a03eab6772784da97db4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93172.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93172"},{"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":"75ef7184053989118d3814c558a9af62e7376a58"},{"fixed":"4cc5caef9a8d1894dfa31d84a0daa0ac1437dadc"},{"fixed":"bc3b5e6519b8df22d622a03eab6772784da97db4"},{"fixed":"1017fe1c7f48e511c5a680e3057005daaff2f3a2"},{"fixed":"2ebce860bdd7ae5e13002811bc9bbbf33fcfc221"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93172.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.8.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93172.json"}}],"schema_version":"1.9.0"}