mm/mm_init: handle alloc_percpu failure in free_area_init_core_hotplug

{
  "id": "fbd1181b31171b47dfc13e1383534a0c88b879f3daeffad73df728d93b9f1f0f",
  "url": "https://osv.dev/vulnerability/CVE-2026-93172",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mm/mm_init: handle alloc_percpu failure in free_area_init_core_hotplug",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mm/mm_init: handle alloc_percpu failure in free_area_init_core_hotplug We miss a failed allocation check for pgdat->per_cpu_nodestats, which results in a NULL deref when we offset into the per-cpu area. Propagate -ENOMEM up the stack and leave per_cpu_nodestats pointing at boot_nodestats so a later online can retry the allocation. hotadd_init_pgdat() returns NULL on failure, which __try_online_node() already maps to -ENOMEM. On failure nothing needs to be unwound: - the node is never marked online - per_cpu_nodestats is left pointing at boot_nodestats - __add_memory_resource() cleans up pending memblock resources - later online attempts retry the per_cpu_nodestats allocation",
    "evidence": "osv:CVE-2026-93172",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.191",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.160",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.52",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-93172",
      "aliases": [
        "CVE-2026-93172"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "75ef7184053989118d3814c558a9af62e7376a58"
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                {
                  "fixed": "eb872b92e26c2576742d541e45f28b50af059b8b"
                },
                {
                  "fixed": "4dda09e7ca0bf0c3fa7c5c8f134d9804b67f455c"
                },
                {
                  "fixed": "4cc5caef9a8d1894dfa31d84a0daa0ac1437dadc"
                },
                {
                  "fixed": "bc3b5e6519b8df22d622a03eab6772784da97db4"
                },
                {
                  "fixed": "1017fe1c7f48e511c5a680e3057005daaff2f3a2"
                },
                {
                  "fixed": "2ebce860bdd7ae5e13002811bc9bbbf33fcfc221"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93172.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.8.0"
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                {
                  "fixed": "6.1.191"
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              ]
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.160"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.110"
                }
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
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                  "fixed": "6.18.52"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93172.json"
          }
        }
      ],
      "modified": "2026-11-01T02:30:33.252379756Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1017fe1c7f48e511c5a680e3057005daaff2f3a2",
        "https://git.kernel.org/stable/c/2ebce860bdd7ae5e13002811bc9bbbf33fcfc221",
        "https://git.kernel.org/stable/c/4cc5caef9a8d1894dfa31d84a0daa0ac1437dadc",
        "https://git.kernel.org/stable/c/4dda09e7ca0bf0c3fa7c5c8f134d9804b67f455c",
        "https://git.kernel.org/stable/c/bc3b5e6519b8df22d622a03eab6772784da97db4",
        "https://git.kernel.org/stable/c/eb872b92e26c2576742d541e45f28b50af059b8b",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93172.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-93172",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93172.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-93172",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 497736,
  "published_at": "2026-09-17T16:12:02.544+00:00"
}