{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-52849",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2023-52849"
  ],
  "published": "2024-05-21T15:34:20Z",
  "summary": "cxl/mem: Fix shutdown order",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/mem: Fix shutdown order\n\nIra reports that removing cxl_mock_mem causes a crash with the following\ntrace:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000044\n [..]\n RIP: 0010:cxl_region_decode_reset+0x7f/0x180 [cxl_core]\n [..]\n Call Trace:\n  <TASK>\n  cxl_region_detach+0xe8/0x210 [cxl_core]\n  cxl_decoder_kill_region+0x27/0x40 [cxl_core]\n  cxld_unregister+0x29/0x40 [cxl_core]\n  devres_release_all+0xb8/0x110\n  device_unbind_cleanup+0xe/0x70\n  device_release_driver_internal+0x1d2/0x210\n  bus_remove_device+0xd7/0x150\n  device_del+0x155/0x3e0\n  device_unregister+0x13/0x60\n  devm_release_action+0x4d/0x90\n  ? __pfx_unregister_port+0x10/0x10 [cxl_core]\n  delete_endpoint+0x121/0x130 [cxl_core]\n  devres_release_all+0xb8/0x110\n  device_unbind_cleanup+0xe/0x70\n  device_release_driver_internal+0x1d2/0x210\n  bus_remove_device+0xd7/0x150\n  device_del+0x155/0x3e0\n  ? lock_release+0x142/0x290\n  cdev_device_del+0x15/0x50\n  cxl_memdev_unregister+0x54/0x70 [cxl_core]\n\nThis crash is due to the clearing out the cxl_memdev's driver context\n(@cxlds) before the subsystem is done with it. This is ultimately due to\nthe region(s), that this memdev is a member, being torn down and expecting\nto be able to de-reference @cxlds, like here:\n\nstatic int cxl_region_decode_reset(struct cxl_region *cxlr, int count)\n...\n                if (cxlds->rcd)\n                        goto endpoint_reset;\n...\n\nFix it by keeping the driver context valid until memdev-device\nunregistration, and subsequently the entire stack of related\ndependencies, unwinds.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.63",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-52849"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/20bd0198bebdd706bd4614b3933ef70d7c19618f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cad22a757029c3a1985c221a2d4a6491ad4035ae"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0ca074f7d788627a4e0b047ca5fbdb5fc567220c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/88d3917f82ed4215a2154432c26de1480a61b209"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-24T06:48:58Z"
  }
}