{"id":"CVE-2026-93172","state":"PUBLISHED","title":"mm/mm_init: handle alloc_percpu failure in free_area_init_core_hotplug","description":"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->per_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","publishedAt":"2026-09-17T16:12:02.544Z","updatedAt":"2026-10-30T12:36:13.116Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"75ef7184053989118d3814c558a9af62e7376a58","status":"affected","lessThan":"eb872b92e26c2576742d541e45f28b50af059b8b","versionType":"git"},{"version":"75ef7184053989118d3814c558a9af62e7376a58","status":"affected","lessThan":"4dda09e7ca0bf0c3fa7c5c8f134d9804b67f455c","versionType":"git"},{"version":"75ef7184053989118d3814c558a9af62e7376a58","status":"affected","lessThan":"4cc5caef9a8d1894dfa31d84a0daa0ac1437dadc","versionType":"git"},{"version":"75ef7184053989118d3814c558a9af62e7376a58","status":"affected","lessThan":"bc3b5e6519b8df22d622a03eab6772784da97db4","versionType":"git"},{"version":"75ef7184053989118d3814c558a9af62e7376a58","status":"affected","lessThan":"1017fe1c7f48e511c5a680e3057005daaff2f3a2","versionType":"git"},{"version":"75ef7184053989118d3814c558a9af62e7376a58","status":"affected","lessThan":"2ebce860bdd7ae5e13002811bc9bbbf33fcfc221","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/linux/memory_hotplug.h","mm/memory_hotplug.c","mm/mm_init.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.8","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/linux/memory_hotplug.h","mm/memory_hotplug.c","mm/mm_init.c"]}],"references":["https://git.kernel.org/stable/c/eb872b92e26c2576742d541e45f28b50af059b8b","https://git.kernel.org/stable/c/4dda09e7ca0bf0c3fa7c5c8f134d9804b67f455c","https://git.kernel.org/stable/c/4cc5caef9a8d1894dfa31d84a0daa0ac1437dadc","https://git.kernel.org/stable/c/bc3b5e6519b8df22d622a03eab6772784da97db4","https://git.kernel.org/stable/c/1017fe1c7f48e511c5a680e3057005daaff2f3a2","https://git.kernel.org/stable/c/2ebce860bdd7ae5e13002811bc9bbbf33fcfc221"],"weaknesses":[],"ingestedAt":"2026-10-30T12:56:04.490Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93172.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93172","state":"PUBLISHED","datePublished":"2026-09-17T16:12:02.544Z","dateUpdated":"2026-10-30T12:36:13.116Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-17T16:02:15.090Z"},"containers":{"cna":{"title":"mm/mm_init: handle alloc_percpu failure in free_area_init_core_hotplug","descriptions":[{"lang":"en","value":"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->per_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"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"75ef7184053989118d3814c558a9af62e7376a58","status":"affected","lessThan":"eb872b92e26c2576742d541e45f28b50af059b8b","versionType":"git"},{"version":"75ef7184053989118d3814c558a9af62e7376a58","status":"affected","lessThan":"4dda09e7ca0bf0c3fa7c5c8f134d9804b67f455c","versionType":"git"},{"version":"75ef7184053989118d3814c558a9af62e7376a58","status":"affected","lessThan":"4cc5caef9a8d1894dfa31d84a0daa0ac1437dadc","versionType":"git"},{"version":"75ef7184053989118d3814c558a9af62e7376a58","status":"affected","lessThan":"bc3b5e6519b8df22d622a03eab6772784da97db4","versionType":"git"},{"version":"75ef7184053989118d3814c558a9af62e7376a58","status":"affected","lessThan":"1017fe1c7f48e511c5a680e3057005daaff2f3a2","versionType":"git"},{"version":"75ef7184053989118d3814c558a9af62e7376a58","status":"affected","lessThan":"2ebce860bdd7ae5e13002811bc9bbbf33fcfc221","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/linux/memory_hotplug.h","mm/memory_hotplug.c","mm/mm_init.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.8","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/linux/memory_hotplug.h","mm/memory_hotplug.c","mm/mm_init.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/eb872b92e26c2576742d541e45f28b50af059b8b"},{"url":"https://git.kernel.org/stable/c/4dda09e7ca0bf0c3fa7c5c8f134d9804b67f455c"},{"url":"https://git.kernel.org/stable/c/4cc5caef9a8d1894dfa31d84a0daa0ac1437dadc"},{"url":"https://git.kernel.org/stable/c/bc3b5e6519b8df22d622a03eab6772784da97db4"},{"url":"https://git.kernel.org/stable/c/1017fe1c7f48e511c5a680e3057005daaff2f3a2"},{"url":"https://git.kernel.org/stable/c/2ebce860bdd7ae5e13002811bc9bbbf33fcfc221"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:36:13.116Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}