cxl/pmem: Fix nvdimm registration races

{
  "id": "577b9bf136dfae4c2d73a4affc99b9672ab4aea194069b073cdb2889f7cdf9fb",
  "url": "https://osv.dev/vulnerability/CVE-2023-54323",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "cxl/pmem: Fix nvdimm registration races",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: cxl/pmem: Fix nvdimm registration races A loop of the form: while true; do modprobe cxl_pci; modprobe -r cxl_pci; done ...fails with the following crash signature: BUG: kernel NULL pointer dereference, address: 0000000000000040 [..] RIP: 0010:cxl_internal_send_cmd+0x5/0xb0 [cxl_core] [..] Call Trace: cxl_pmem_ctl+0x121/0x240 [cxl_pmem] nvdimm_get_config_data+0xd6/0x1a0 [libnvdimm] nd_label_data_init+0x135/0x7e0 [libnvdimm] nvdimm_probe+0xd6/0x1c0 [libnvdimm] nvdimm_bus_probe+0x7a/0x1e0 [libnvdimm] really_probe+0xde/0x380 __driver_probe_device+0x78/0x170 driver_probe_device+0x1f/0x90 __device_attach_driver+0x85/0x110 bus_for_each_drv+0x7d/0xc0 __device_attach+0xb4/0x1e0 bus_probe_device+0x9f/0xc0 device_add+0x445/0x9c0 nd_async_device_register+0xe/0x40 [libnvdimm] async_run_entry_fn+0x30/0x130 ...namely that the bottom half of async nvdimm device registration runs after the CXL has already torn down the context that cxl_pmem_ctl() needs. Unlike the ACPI NFIT case that benefits from launching multiple nvdimm device registrations in parallel from those listed in the table, CXL is already marked PROBE_PREFER_ASYNCHRONOUS. So provide for a synchronous registration path to preclude this scenario.",
    "evidence": "osv:CVE-2023-54323",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.16",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.2.3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-54323",
      "aliases": [
        "CVE-2023-54323"
      ],
      "affected": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "21083f51521fb0f60dbac591f175c3ed48435af4"
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                {
                  "fixed": "a371788d4f4a7f59eecd22644331d599979fd283"
                },
                {
                  "fixed": "18c65667fa9104780eeaa0dc1bc240f0c2094772"
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                {
                  "fixed": "f57aec443c24d2e8e1f3b5b4856aea12ddda4254"
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54323.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.14.0"
                },
                {
                  "fixed": "6.1.16"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
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                {
                  "fixed": "6.2.3"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54323.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.378448938Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/18c65667fa9104780eeaa0dc1bc240f0c2094772",
        "https://git.kernel.org/stable/c/a371788d4f4a7f59eecd22644331d599979fd283",
        "https://git.kernel.org/stable/c/f57aec443c24d2e8e1f3b5b4856aea12ddda4254",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54323.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-54323",
        "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/2023/54xxx/CVE-2023-54323.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-54323",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 496359,
  "published_at": "2025-12-30T12:37:07.656+00:00"
}