{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/mem: Fix no cxl_nvd during pmem region auto-assembling\n\nWhen CXL subsystem is auto-assembling a pmem region during cxl\nendpoint port probing, always hit below calltrace.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000078\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n RIP: 0010:cxl_pmem_region_probe+0x22e/0x360 [cxl_pmem]\n Call Trace:\n  <TASK>\n  ? __die+0x24/0x70\n  ? page_fault_oops+0x82/0x160\n  ? do_user_addr_fault+0x65/0x6b0\n  ? exc_page_fault+0x7d/0x170\n  ? asm_exc_page_fault+0x26/0x30\n  ? cxl_pmem_region_probe+0x22e/0x360 [cxl_pmem]\n  ? cxl_pmem_region_probe+0x1ac/0x360 [cxl_pmem]\n  cxl_bus_probe+0x1b/0x60 [cxl_core]\n  really_probe+0x173/0x410\n  ? __pfx___device_attach_driver+0x10/0x10\n  __driver_probe_device+0x80/0x170\n  driver_probe_device+0x1e/0x90\n  __device_attach_driver+0x90/0x120\n  bus_for_each_drv+0x84/0xe0\n  __device_attach+0xbc/0x1f0\n  bus_probe_device+0x90/0xa0\n  device_add+0x51c/0x710\n  devm_cxl_add_pmem_region+0x1b5/0x380 [cxl_core]\n  cxl_bus_probe+0x1b/0x60 [cxl_core]\n\nThe cxl_nvd of the memdev needs to be available during the pmem region\nprobe. Currently the cxl_nvd is registered after the endpoint port probe.\nThe endpoint probe, in the case of autoassembly of regions, can cause a\npmem region probe requiring the not yet available cxl_nvd. Adjust the\nsequence so this dependency is met.\n\nThis requires adding a port parameter to cxl_find_nvdimm_bridge() that\ncan be used to query the ancestor root port. The endpoint port is not\nyet available, but will share a common ancestor with its parent, so\nstart the query from there instead."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/cxl/core/pmem.c",
                  "drivers/cxl/core/region.c",
                  "drivers/cxl/cxl.h",
                  "drivers/cxl/mem.c"
               ],
               "versions": [
                  {
                     "version": "f17b558d6663",
                     "lessThan": "1d064e4fbebc",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f17b558d6663",
                     "lessThan": "84ec985944ef",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/cxl/core/pmem.c",
                  "drivers/cxl/core/region.c",
                  "drivers/cxl/cxl.h",
                  "drivers/cxl/mem.c"
               ],
               "versions": [
                  {
                     "version": "6.2",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "6.2",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.9.8",
                     "lessThanOrEqual": "6.9.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.10",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/1d064e4fbebcf5b18dc10c1f3973487eb163b600"
            },
            {
               "url": "https://git.kernel.org/stable/c/84ec985944ef34a34a1605b93ce401aa8737af96"
            }
         ],
         "title": "cxl/mem: Fix no cxl_nvd during pmem region auto-assembling",
         "x_generator": {
            "engine": "bippy-c9c4e1df01b2"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2024-41085",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}