cpu/hotplug: Don't offline the last non-isolated CPU

{
  "id": "c94c652767282123fc58fce4882586dacd99b53610330e4c084c0913184dd136",
  "url": "https://osv.dev/vulnerability/CVE-2023-52831",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "cpu/hotplug: Don't offline the last non-isolated CPU",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: cpu/hotplug: Don't offline the last non-isolated CPU If a system has isolated CPUs via the \"isolcpus=\" command line parameter, then an attempt to offline the last housekeeping CPU will result in a WARN_ON() when rebuilding the scheduler domains and a subsequent panic due to and unhandled empty CPU mas in partition_sched_domains_locked(). cpuset_hotplug_workfn() rebuild_sched_domains_locked() ndoms = generate_sched_domains(&doms, &attr); cpumask_and(doms[0], top_cpuset.effective_cpus, housekeeping_cpumask(HK_FLAG_DOMAIN)); Thus results in an empty CPU mask which triggers the warning and then the subsequent crash: WARNING: CPU: 4 PID: 80 at kernel/sched/topology.c:2366 build_sched_domains+0x120c/0x1408 Call trace: build_sched_domains+0x120c/0x1408 partition_sched_domains_locked+0x234/0x880 rebuild_sched_domains_locked+0x37c/0x798 rebuild_sched_domains+0x30/0x58 cpuset_hotplug_workfn+0x2a8/0x930 Unable to handle kernel paging request at virtual address fffe80027ab37080 partition_sched_domains_locked+0x318/0x880 rebuild_sched_domains_locked+0x37c/0x798 Aside of the resulting crash, it does not make any sense to offline the last last housekeeping CPU. Prevent this by masking out the non-housekeeping CPUs when selecting a target CPU for initiating the CPU unplug operation via the work queue.",
    "evidence": "osv:CVE-2023-52831",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.64",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.5.13",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-52831",
      "aliases": [
        "CVE-2023-52831"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "fea9dd8653ff39ce383c54e747bde4c39289b4ad"
                },
                {
                  "fixed": "3410b702354702b500bde10e3cc1f9db8731d908"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "07f9e0c9987bf1c4ef57611ad2f789ba68978102"
                },
                {
                  "fixed": "335a47ed71e332c82339d1aec0c7f6caccfcda13"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "2b8272ff4a70b866106ae13c36be7ecbef5d5da2"
                },
                {
                  "fixed": "3073f6df783d9d75f7f69f73e16c7ef85d6cfb63"
                },
                {
                  "fixed": "38685e2a0476127db766f81b1c06019ddc4c9ffa"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6.1.53"
                },
                {
                  "fixed": "6.1.64"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6.5.3"
                },
                {
                  "fixed": "6.5.13"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6.4.16"
                },
                {
                  "fixed": "6.5"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9734e4c0c470258c32b6aa5ea7ef8a86506c0909"
                }
              ]
            }
          ],
          "versions": [
            "v6.1.63",
            "v6.1.62",
            "v6.1.61",
            "v6.1.60",
            "v6.1.59",
            "v6.1.58",
            "v6.1.57",
            "v6.1.56",
            "v6.1.55",
            "v6.1.54",
            "v6.1.53",
            "v6.5.12",
            "v6.5.11",
            "v6.5.10",
            "v6.5.9",
            "v6.5.8",
            "v6.5.7",
            "v6.5.6",
            "v6.5.5",
            "v6.5.4",
            "v6.5.3",
            "v6.4.16"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-52831.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6.1.64"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.5.13"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.6.0"
                },
                {
                  "fixed": "6.6.3"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-52831.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:22.025096815Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3073f6df783d9d75f7f69f73e16c7ef85d6cfb63",
        "https://git.kernel.org/stable/c/335a47ed71e332c82339d1aec0c7f6caccfcda13",
        "https://git.kernel.org/stable/c/3410b702354702b500bde10e3cc1f9db8731d908",
        "https://git.kernel.org/stable/c/38685e2a0476127db766f81b1c06019ddc4c9ffa",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52831.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-52831",
        "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/2023/52xxx/CVE-2023-52831.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-52831",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 487962,
  "published_at": "2024-05-21T15:31:33.566+00:00"
}