{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2024-41085",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "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."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Linux",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "f17b558d6663",
                                            "version_value": "1d064e4fbebc"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "6.2",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "6.2",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.9.8",
                                                        "lessThanOrEqual": "6.9.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.10",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/1d064e4fbebcf5b18dc10c1f3973487eb163b600",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/1d064e4fbebcf5b18dc10c1f3973487eb163b600"
            },
            {
                "url": "https://git.kernel.org/stable/c/84ec985944ef34a34a1605b93ce401aa8737af96",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/84ec985944ef34a34a1605b93ce401aa8737af96"
            }
        ]
    },
    "generator": {
        "engine": "bippy-9e1c9544281a"
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}