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FKIE_CVE-2026-93172

Vulnerability from fkie_nvd - Published: 2026-09-17 17:18 - Updated: 2026-09-17 17:18
Severity
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
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1017fe1c7f48e511c5a680e3057005daaff2f3a2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2ebce860bdd7ae5e13002811bc9bbbf33fcfc221
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4cc5caef9a8d1894dfa31d84a0daa0ac1437dadc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bc3b5e6519b8df22d622a03eab6772784da97db4
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/memory_hotplug.h",
            "mm/memory_hotplug.c",
            "mm/mm_init.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4cc5caef9a8d1894dfa31d84a0daa0ac1437dadc",
              "status": "affected",
              "version": "75ef7184053989118d3814c558a9af62e7376a58",
              "versionType": "git"
            },
            {
              "lessThan": "bc3b5e6519b8df22d622a03eab6772784da97db4",
              "status": "affected",
              "version": "75ef7184053989118d3814c558a9af62e7376a58",
              "versionType": "git"
            },
            {
              "lessThan": "1017fe1c7f48e511c5a680e3057005daaff2f3a2",
              "status": "affected",
              "version": "75ef7184053989118d3814c558a9af62e7376a58",
              "versionType": "git"
            },
            {
              "lessThan": "2ebce860bdd7ae5e13002811bc9bbbf33fcfc221",
              "status": "affected",
              "version": "75ef7184053989118d3814c558a9af62e7376a58",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/memory_hotplug.h",
            "mm/memory_hotplug.c",
            "mm/mm_init.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.8"
            },
            {
              "lessThan": "4.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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-\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"
    }
  ],
  "id": "CVE-2026-93172",
  "lastModified": "2026-09-17T17:18:12.943",
  "metrics": {},
  "published": "2026-09-17T17:18:12.943",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1017fe1c7f48e511c5a680e3057005daaff2f3a2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2ebce860bdd7ae5e13002811bc9bbbf33fcfc221"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4cc5caef9a8d1894dfa31d84a0daa0ac1437dadc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bc3b5e6519b8df22d622a03eab6772784da97db4"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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