cxl/mem: Fix shutdown order

{
  "id": "c160e524d02894f3a34925abd99df888f75b9b6ad387fa3bc55f65ee679a4cc5",
  "url": "https://osv.dev/vulnerability/CVE-2023-52849",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "cxl/mem: Fix shutdown order",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: cxl/mem: Fix shutdown order Ira reports that removing cxl_mock_mem causes a crash with the following trace: BUG: kernel NULL pointer dereference, address: 0000000000000044 [..] RIP: 0010:cxl_region_decode_reset+0x7f/0x180 [cxl_core] [..] Call Trace: cxl_region_detach+0xe8/0x210 [cxl_core] cxl_decoder_kill_region+0x27/0x40 [cxl_core] cxld_unregister+0x29/0x40 [cxl_core] devres_release_all+0xb8/0x110 device_unbind_cleanup+0xe/0x70 device_release_driver_internal+0x1d2/0x210 bus_remove_device+0xd7/0x150 device_del+0x155/0x3e0 device_unregister+0x13/0x60 devm_release_action+0x4d/0x90 ? __pfx_unregister_port+0x10/0x10 [cxl_core] delete_endpoint+0x121/0x130 [cxl_core] devres_release_all+0xb8/0x110 device_unbind_cleanup+0xe/0x70 device_release_driver_internal+0x1d2/0x210 bus_remove_device+0xd7/0x150 device_del+0x155/0x3e0 ? lock_release+0x142/0x290 cdev_device_del+0x15/0x50 cxl_memdev_unregister+0x54/0x70 [cxl_core] This crash is due to the clearing out the cxl_memdev's driver context (@cxlds) before the subsystem is done with it. This is ultimately due to the region(s), that this memdev is a member, being torn down and expecting to be able to de-reference @cxlds, like here: static int cxl_region_decode_reset(struct cxl_region *cxlr, int count) ... if (cxlds->rcd) goto endpoint_reset; ... Fix it by keeping the driver context valid until memdev-device unregistration, and subsequently the entire stack of related depend",
    "evidence": "osv:CVE-2023-52849",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-52849",
      "aliases": [
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      ],
      "modified": "2026-10-28T02:30:34.191974112Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0ca074f7d788627a4e0b047ca5fbdb5fc567220c",
        "https://git.kernel.org/stable/c/20bd0198bebdd706bd4614b3933ef70d7c19618f",
        "https://git.kernel.org/stable/c/7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b",
        "https://git.kernel.org/stable/c/88d3917f82ed4215a2154432c26de1480a61b209",
        "https://git.kernel.org/stable/c/cad22a757029c3a1985c221a2d4a6491ad4035ae",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52849.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-52849",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
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    "related_cves": [
      {
        "value": "CVE-2023-52849",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 501222,
  "published_at": "2024-05-21T15:31:45.884+00:00"
}