CVE-2026-72010
Full vulnerability record from the local CVENow database.
Description
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 ]
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-08-15 06:20:59.670000
Last modified
2026-11-06 17:19:34.807000
View original CVE JSON
{
"id": "CVE-2026-72010",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-08-15T06:20:59.670",
"lastModified": "2026-11-06T17:19:34.807",
"vulnStatus": "Received",
"cveTags": [],
"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 > /sys/devices/system/cpu/cpu1/online\n echo 1 > /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->mems_allowed) which is not guaranteed to have\nnodes to the rebind routine. Use cs->effective_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 ]"
}
],
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{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-11-06T16:50:22.064855Z",
"id": "CVE-2026-72010",
"options": [
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{
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