cgroup/cpuset: rebind mm mempolicy to effective_mems, not mems_allowed

{
  "id": "5237de9698fed05fb18da53dac96d648922dce2f8bcefefe8789dabacf654046",
  "url": "https://osv.dev/vulnerability/CVE-2026-72010",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "cgroup/cpuset: rebind mm mempolicy to effective_mems, not mems_allowed",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: cgroup/cpuset: rebind mm mempolicy to effective_mems, not mems_allowed Creating a child cpuset where cpuset.mems is never set leads to a div/0 when a VMA mempolicy with MPOL_F_RELATIVE_NODES rebinds in response to a CPU hotplug event. Reproduction steps: 1) Create a cgroup w/ cpuset controls (do not set cpuset.mems) 2) Move the task into the child cpuset 3) Create a VMA mempolicy for that task with MPOL_F_RELATIVE_NODES 4) unplug and hotplug a cpu echo 0 > /sys/devices/system/cpu/cpu1/online echo 1 > /sys/devices/system/cpu/cpu1/online 5) mempolicy rebind does a div/0 in mpol_relative_nodemask on the call to __nodes_fold() The cpuset code passes (cs->mems_allowed) which is not guaranteed to have nodes to the rebind routine. Use cs->effective_mems instead, which is guaranteed to have a non-empty nodemask once we reach that code path. [ david: add a comment, slightly rephrase description ]",
    "evidence": "osv:CVE-2026-72010",
    "products": [
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        "prerequisites": [],
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    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-72010",
      "aliases": [
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      ],
      "modified": "2026-10-28T02:30:26.799537365Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/02f67c4f88be8e3dbd91951d13cdcc5bcc82e9c7",
        "https://git.kernel.org/stable/c/4b06449384b9ee5b3372bab60601ba5cd4162086",
        "https://git.kernel.org/stable/c/b7adeba2a21c98c7b20f18e27e3ead86bdb5e08d",
        "https://git.kernel.org/stable/c/b983c56426383e4a06fa5970c4e33cee879b1482",
        "https://git.kernel.org/stable/c/c17f06d8a085d6be58b544a440ce243f5e441a60",
        "https://git.kernel.org/stable/c/c844b7d9a9586de15dd28c06da5cc7f6ab28787d",
        "https://git.kernel.org/stable/c/fc680afc510157f6b137956011c09abc23eb0842",
        "https://git.kernel.org/stable/c/fcc8c310539c3cc523419113b227161a96b50550",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72010.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-72010",
        "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/2026/72xxx/CVE-2026-72010.json"
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    "related_cves": [
      {
        "value": "CVE-2026-72010",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 493517,
  "published_at": "2026-08-15T05:51:39.755+00:00"
}