{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2024-39476",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid5: fix deadlock that raid5d() wait for itself to clear MD_SB_CHANGE_PENDING\n\nXiao reported that lvm2 test lvconvert-raid-takeover.sh can hang with\nsmall possibility, the root cause is exactly the same as commit\nbed9e27baf52 (\"Revert \"md/raid5: Wait for MD_SB_CHANGE_PENDING in raid5d\"\")\n\nHowever, Dan reported another hang after that, and junxiao investigated\nthe problem and found out that this is caused by plugged bio can't issue\nfrom raid5d().\n\nCurrent implementation in raid5d() has a weird dependence:\n\n1) md_check_recovery() from raid5d() must hold 'reconfig_mutex' to clear\n   MD_SB_CHANGE_PENDING;\n2) raid5d() handles IO in a deadloop, until all IO are issued;\n3) IO from raid5d() must wait for MD_SB_CHANGE_PENDING to be cleared;\n\nThis behaviour is introduce before v2.6, and for consequence, if other\ncontext hold 'reconfig_mutex', and md_check_recovery() can't update\nsuper_block, then raid5d() will waste one cpu 100% by the deadloop, until\n'reconfig_mutex' is released.\n\nRefer to the implementation from raid1 and raid10, fix this problem by\nskipping issue IO if MD_SB_CHANGE_PENDING is still set after\nmd_check_recovery(), daemon thread will be woken up when 'reconfig_mutex'\nis released. Meanwhile, the hang problem will be fixed as well."
            }
        ]
    },
    "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": "f3d55bd5b7b9",
                                            "version_value": "b32aa95843ca"
                                        },
                                        {
                                            "version_affected": "<",
                                            "version_name": "1c00bb624cd0",
                                            "version_value": "634ba3c97ec4"
                                        },
                                        {
                                            "version_affected": "<",
                                            "version_name": "782b3e71c957",
                                            "version_value": "aa64464c8f4d"
                                        },
                                        {
                                            "version_affected": "<",
                                            "version_name": "9e86dffd0b02",
                                            "version_value": "098d54934814"
                                        },
                                        {
                                            "version_affected": "<",
                                            "version_name": "5e2cf333b7bd",
                                            "version_value": "3f8d5e802d4c"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "6.1",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "6.1",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "4.19.316",
                                                        "lessThanOrEqual": "4.19.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.4.278",
                                                        "lessThanOrEqual": "5.4.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.10.219",
                                                        "lessThanOrEqual": "5.10.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.15.161",
                                                        "lessThanOrEqual": "5.15.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.1.94",
                                                        "lessThanOrEqual": "6.1.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.6.34",
                                                        "lessThanOrEqual": "6.6.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.9.5",
                                                        "lessThanOrEqual": "6.9.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.10",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
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                                                ],
                                                "defaultStatus": "affected"
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    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/b32aa95843cac6b12c2c014d40fca18aef24a347",
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                "url": "https://git.kernel.org/stable/c/634ba3c97ec413cb10681c7b196db43ee461ecf4",
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                "name": "https://git.kernel.org/stable/c/634ba3c97ec413cb10681c7b196db43ee461ecf4"
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                "name": "https://git.kernel.org/stable/c/aa64464c8f4d2ab92f6d0b959a1e0767b829d787"
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                "name": "https://git.kernel.org/stable/c/3f8d5e802d4cedd445f9a89be8c3fd2d0e99024b"
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                "url": "https://git.kernel.org/stable/c/cd2538e5af495b3c747e503db346470fc1ffc447",
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                "name": "https://git.kernel.org/stable/c/cd2538e5af495b3c747e503db346470fc1ffc447"
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                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/e332a12f65d8fed8cf63bedb4e9317bb872b9ac7"
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                "refsource": "MISC",
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