{"id":"CVE-2026-72010","state":"PUBLISHED","title":"cgroup/cpuset: rebind mm mempolicy to effective_mems, not mems_allowed","description":"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 ]","publishedAt":"2026-08-15T05:51:39.755Z","updatedAt":"2026-08-17T05:06:32.084Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ae1c802382f7af60aa54879fb4f5920a9df1ff48","status":"affected","lessThan":"b7adeba2a21c98c7b20f18e27e3ead86bdb5e08d","versionType":"git"},{"version":"ae1c802382f7af60aa54879fb4f5920a9df1ff48","status":"affected","lessThan":"fcc8c310539c3cc523419113b227161a96b50550","versionType":"git"},{"version":"ae1c802382f7af60aa54879fb4f5920a9df1ff48","status":"affected","lessThan":"4b06449384b9ee5b3372bab60601ba5cd4162086","versionType":"git"},{"version":"ae1c802382f7af60aa54879fb4f5920a9df1ff48","status":"affected","lessThan":"02f67c4f88be8e3dbd91951d13cdcc5bcc82e9c7","versionType":"git"},{"version":"ae1c802382f7af60aa54879fb4f5920a9df1ff48","status":"affected","lessThan":"fc680afc510157f6b137956011c09abc23eb0842","versionType":"git"},{"version":"ae1c802382f7af60aa54879fb4f5920a9df1ff48","status":"affected","lessThan":"c844b7d9a9586de15dd28c06da5cc7f6ab28787d","versionType":"git"},{"version":"ae1c802382f7af60aa54879fb4f5920a9df1ff48","status":"affected","lessThan":"c17f06d8a085d6be58b544a440ce243f5e441a60","versionType":"git"},{"version":"ae1c802382f7af60aa54879fb4f5920a9df1ff48","status":"affected","lessThan":"b983c56426383e4a06fa5970c4e33cee879b1482","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/cgroup/cpuset.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.17","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/cgroup/cpuset.c"]}],"references":["https://git.kernel.org/stable/c/b7adeba2a21c98c7b20f18e27e3ead86bdb5e08d","https://git.kernel.org/stable/c/fcc8c310539c3cc523419113b227161a96b50550","https://git.kernel.org/stable/c/4b06449384b9ee5b3372bab60601ba5cd4162086","https://git.kernel.org/stable/c/02f67c4f88be8e3dbd91951d13cdcc5bcc82e9c7","https://git.kernel.org/stable/c/fc680afc510157f6b137956011c09abc23eb0842","https://git.kernel.org/stable/c/c844b7d9a9586de15dd28c06da5cc7f6ab28787d","https://git.kernel.org/stable/c/c17f06d8a085d6be58b544a440ce243f5e441a60","https://git.kernel.org/stable/c/b983c56426383e4a06fa5970c4e33cee879b1482"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72010.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72010","state":"PUBLISHED","datePublished":"2026-08-15T05:51:39.755Z","dateUpdated":"2026-08-17T05:06:32.084Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.899Z"},"containers":{"cna":{"title":"cgroup/cpuset: rebind mm mempolicy to effective_mems, not mems_allowed","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 ]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ae1c802382f7af60aa54879fb4f5920a9df1ff48","status":"affected","lessThan":"b7adeba2a21c98c7b20f18e27e3ead86bdb5e08d","versionType":"git"},{"version":"ae1c802382f7af60aa54879fb4f5920a9df1ff48","status":"affected","lessThan":"fcc8c310539c3cc523419113b227161a96b50550","versionType":"git"},{"version":"ae1c802382f7af60aa54879fb4f5920a9df1ff48","status":"affected","lessThan":"4b06449384b9ee5b3372bab60601ba5cd4162086","versionType":"git"},{"version":"ae1c802382f7af60aa54879fb4f5920a9df1ff48","status":"affected","lessThan":"02f67c4f88be8e3dbd91951d13cdcc5bcc82e9c7","versionType":"git"},{"version":"ae1c802382f7af60aa54879fb4f5920a9df1ff48","status":"affected","lessThan":"fc680afc510157f6b137956011c09abc23eb0842","versionType":"git"},{"version":"ae1c802382f7af60aa54879fb4f5920a9df1ff48","status":"affected","lessThan":"c844b7d9a9586de15dd28c06da5cc7f6ab28787d","versionType":"git"},{"version":"ae1c802382f7af60aa54879fb4f5920a9df1ff48","status":"affected","lessThan":"c17f06d8a085d6be58b544a440ce243f5e441a60","versionType":"git"},{"version":"ae1c802382f7af60aa54879fb4f5920a9df1ff48","status":"affected","lessThan":"b983c56426383e4a06fa5970c4e33cee879b1482","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/cgroup/cpuset.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.17","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/cgroup/cpuset.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:06:32.084Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}