{
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    "dataVersion": "5.1",
    "cveMetadata": {
        "cveId": "CVE-2023-52849",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2024-05-21T15:19:24.255Z",
        "datePublished": "2024-05-21T15:31:45.884Z",
        "dateUpdated": "2024-08-02T23:11:35.944Z"
    },
    "containers": {
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                "shortName": "Linux",
                "dateUpdated": "2024-05-29T05:18:25.009Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "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."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/cxl/core/memdev.c"
                    ],
                    "versions": [
                        {
                            "version": "9cc238c7a526",
                            "lessThan": "20bd0198bebd",
                            "status": "affected",
                            "versionType": "git"
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                        {
                            "version": "9cc238c7a526",
                            "lessThan": "7c7371b41a14",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
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                            "lessThan": "cad22a757029",
                            "status": "affected",
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                            "lessThan": "0ca074f7d788",
                            "status": "affected",
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                    ]
                },
                {
                    "product": "Linux",
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                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/cxl/core/memdev.c"
                    ],
                    "versions": [
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                            "version": "5.15",
                            "status": "affected"
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                        {
                            "version": "0",
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                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "5.15.139",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "6.1.63",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "6.5.12",
                            "lessThanOrEqual": "6.5.*",
                            "status": "unaffected",
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                        {
                            "version": "6.6.2",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "6.7",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
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            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/20bd0198bebdd706bd4614b3933ef70d7c19618f"
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                {
                    "url": "https://git.kernel.org/stable/c/88d3917f82ed4215a2154432c26de1480a61b209"
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            "title": "cxl/mem: Fix shutdown order",
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                "title": "CVE Program Container",
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