CVE-2026-72010 (GCVE-0-2026-72010)
Vulnerability from cvelistv5
Published
2026-08-15 05:51
Modified
2026-08-17 05:06
Severity ?
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 ]
References
Impacted products
Vendor Product Version
Linux Linux Version: ae1c802382f7af60aa54879fb4f5920a9df1ff48
Version: ae1c802382f7af60aa54879fb4f5920a9df1ff48
Version: ae1c802382f7af60aa54879fb4f5920a9df1ff48
Version: ae1c802382f7af60aa54879fb4f5920a9df1ff48
Version: ae1c802382f7af60aa54879fb4f5920a9df1ff48
Version: ae1c802382f7af60aa54879fb4f5920a9df1ff48
Version: ae1c802382f7af60aa54879fb4f5920a9df1ff48
Version: ae1c802382f7af60aa54879fb4f5920a9df1ff48
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{
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          "programFiles": [
            "kernel/cgroup/cpuset.c"
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      "cpeApplicability": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncgroup/cpuset: rebind mm mempolicy to effective_mems, not mems_allowed\n\nCreating a child cpuset where cpuset.mems is never set leads to a div/0\nwhen a VMA mempolicy with MPOL_F_RELATIVE_NODES rebinds in response to a\nCPU hotplug event.\n\nReproduction steps:\n 1) Create a cgroup w/ cpuset controls (do not set cpuset.mems)\n 2) Move the task into the child cpuset\n 3) Create a VMA mempolicy for that task with MPOL_F_RELATIVE_NODES\n 4) unplug and hotplug a cpu\n      echo 0 \u003e /sys/devices/system/cpu/cpu1/online\n      echo 1 \u003e /sys/devices/system/cpu/cpu1/online\n 5) mempolicy rebind does a div/0 in mpol_relative_nodemask on the\n    call to __nodes_fold()\n\nThe cpuset code passes (cs-\u003emems_allowed) which is not guaranteed to have\nnodes to the rebind routine.  Use cs-\u003eeffective_mems instead, which is\nguaranteed to have a non-empty nodemask once we reach that code path.\n\n[ david: add a comment, slightly rephrase description ]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:06:32.084Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b7adeba2a21c98c7b20f18e27e3ead86bdb5e08d"
        },
        {
          "url": "https://git.kernel.org/stable/c/fcc8c310539c3cc523419113b227161a96b50550"
        },
        {
          "url": "https://git.kernel.org/stable/c/4b06449384b9ee5b3372bab60601ba5cd4162086"
        },
        {
          "url": "https://git.kernel.org/stable/c/02f67c4f88be8e3dbd91951d13cdcc5bcc82e9c7"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc680afc510157f6b137956011c09abc23eb0842"
        },
        {
          "url": "https://git.kernel.org/stable/c/c844b7d9a9586de15dd28c06da5cc7f6ab28787d"
        },
        {
          "url": "https://git.kernel.org/stable/c/c17f06d8a085d6be58b544a440ce243f5e441a60"
        },
        {
          "url": "https://git.kernel.org/stable/c/b983c56426383e4a06fa5970c4e33cee879b1482"
        }
      ],
      "title": "cgroup/cpuset: rebind mm mempolicy to effective_mems, not mems_allowed",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72010",
    "datePublished": "2026-08-15T05:51:39.755Z",
    "dateReserved": "2026-08-09T03:40:39.899Z",
    "dateUpdated": "2026-08-17T05:06:32.084Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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