{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpu/hotplug: Don't offline the last non-isolated CPU\n\nIf a system has isolated CPUs via the \"isolcpus=\" command line parameter,\nthen an attempt to offline the last housekeeping CPU will result in a\nWARN_ON() when rebuilding the scheduler domains and a subsequent panic due\nto and unhandled empty CPU mas in partition_sched_domains_locked().\n\ncpuset_hotplug_workfn()\n  rebuild_sched_domains_locked()\n    ndoms = generate_sched_domains(&doms, &attr);\n      cpumask_and(doms[0], top_cpuset.effective_cpus, housekeeping_cpumask(HK_FLAG_DOMAIN));\n\nThus results in an empty CPU mask which triggers the warning and then the\nsubsequent crash:\n\nWARNING: CPU: 4 PID: 80 at kernel/sched/topology.c:2366 build_sched_domains+0x120c/0x1408\nCall trace:\n build_sched_domains+0x120c/0x1408\n partition_sched_domains_locked+0x234/0x880\n rebuild_sched_domains_locked+0x37c/0x798\n rebuild_sched_domains+0x30/0x58\n cpuset_hotplug_workfn+0x2a8/0x930\n\nUnable to handle kernel paging request at virtual address fffe80027ab37080\n partition_sched_domains_locked+0x318/0x880\n rebuild_sched_domains_locked+0x37c/0x798\n\nAside of the resulting crash, it does not make any sense to offline the last\nlast housekeeping CPU.\n\nPrevent this by masking out the non-housekeeping CPUs when selecting a\ntarget CPU for initiating the CPU unplug operation via the work queue."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "kernel/cpu.c"
               ],
               "versions": [
                  {
                     "version": "1da177e4c3f4",
                     "lessThan": "3410b7023547",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1da177e4c3f4",
                     "lessThan": "335a47ed71e3",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1da177e4c3f4",
                     "lessThan": "3073f6df783d",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1da177e4c3f4",
                     "lessThan": "38685e2a0476",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "kernel/cpu.c"
               ],
               "versions": [
                  {
                     "version": "6.1.64",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.5.13",
                     "lessThanOrEqual": "6.5.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.3",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.7",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/3410b702354702b500bde10e3cc1f9db8731d908"
            },
            {
               "url": "https://git.kernel.org/stable/c/335a47ed71e332c82339d1aec0c7f6caccfcda13"
            },
            {
               "url": "https://git.kernel.org/stable/c/3073f6df783d9d75f7f69f73e16c7ef85d6cfb63"
            },
            {
               "url": "https://git.kernel.org/stable/c/38685e2a0476127db766f81b1c06019ddc4c9ffa"
            }
         ],
         "title": "cpu/hotplug: Don't offline the last non-isolated CPU",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2023-52831",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}