cvelist/2023/52xxx/CVE-2023-52849.json

{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2023-52849",
        "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 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."
            }
        ]
    },
    "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": "9cc238c7a526",
                                            "version_value": "20bd0198bebd"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "5.15",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "5.15",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "5.15.139",
                                                        "lessThanOrEqual": "5.15.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.1.63",
                                                        "lessThanOrEqual": "6.1.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.5.12",
                                                        "lessThanOrEqual": "6.5.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.6.2",
                                                        "lessThanOrEqual": "6.6.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.7",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/20bd0198bebdd706bd4614b3933ef70d7c19618f",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/20bd0198bebdd706bd4614b3933ef70d7c19618f"
            },
            {
                "url": "https://git.kernel.org/stable/c/7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b"
            },
            {
                "url": "https://git.kernel.org/stable/c/cad22a757029c3a1985c221a2d4a6491ad4035ae",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/cad22a757029c3a1985c221a2d4a6491ad4035ae"
            },
            {
                "url": "https://git.kernel.org/stable/c/0ca074f7d788627a4e0b047ca5fbdb5fc567220c",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/0ca074f7d788627a4e0b047ca5fbdb5fc567220c"
            },
            {
                "url": "https://git.kernel.org/stable/c/88d3917f82ed4215a2154432c26de1480a61b209",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/88d3917f82ed4215a2154432c26de1480a61b209"
            }
        ]
    },
    "generator": {
        "engine": "bippy-9e1c9544281a"
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