{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2023-52492",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: fix NULL pointer in channel unregistration function\n\n__dma_async_device_channel_register() can fail. In case of failure,\nchan->local is freed (with free_percpu()), and chan->local is nullified.\nWhen dma_async_device_unregister() is called (because of managed API or\nintentionally by DMA controller driver), channels are unconditionally\nunregistered, leading to this NULL pointer:\n[    1.318693] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000d0\n[...]\n[    1.484499] Call trace:\n[    1.486930]  device_del+0x40/0x394\n[    1.490314]  device_unregister+0x20/0x7c\n[    1.494220]  __dma_async_device_channel_unregister+0x68/0xc0\n\nLook at dma_async_device_register() function error path, channel device\nunregistration is done only if chan->local is not NULL.\n\nThen add the same condition at the beginning of\n__dma_async_device_channel_unregister() function, to avoid NULL pointer\nissue whatever the API used to reach this function."
            }
        ]
    },
    "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": "d2fb0a043838",
                                            "version_value": "9de69732dde4"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "5.6",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "5.6",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.10.210",
                                                        "lessThanOrEqual": "5.10.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.15.149",
                                                        "lessThanOrEqual": "5.15.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.1.76",
                                                        "lessThanOrEqual": "6.1.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.6.15",
                                                        "lessThanOrEqual": "6.6.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.7.3",
                                                        "lessThanOrEqual": "6.7.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.8",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
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                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
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                            }
                        ]
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    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/9de69732dde4e443c1c7f89acbbed2c45a6a8e17",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/9de69732dde4e443c1c7f89acbbed2c45a6a8e17"
            },
            {
                "url": "https://git.kernel.org/stable/c/047fce470412ab64cb7345f9ff5d06919078ad79",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/047fce470412ab64cb7345f9ff5d06919078ad79"
            },
            {
                "url": "https://git.kernel.org/stable/c/2ab32986a0b9e329eb7f8f04dd57cc127f797c08",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/2ab32986a0b9e329eb7f8f04dd57cc127f797c08"
            },
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                "url": "https://git.kernel.org/stable/c/7f0ccfad2031eddcc510caf4e57f2d4aa2d8a50b",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/7f0ccfad2031eddcc510caf4e57f2d4aa2d8a50b"
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                "url": "https://git.kernel.org/stable/c/9263fd2a63487c6d04cbb7b74a48fb12e1e352d0",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/9263fd2a63487c6d04cbb7b74a48fb12e1e352d0"
            },
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                "url": "https://git.kernel.org/stable/c/f5c24d94512f1b288262beda4d3dcb9629222fc7",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/f5c24d94512f1b288262beda4d3dcb9629222fc7"
            },
            {
                "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html",
                "refsource": "MISC",
                "name": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
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