{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-39476",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-39476"
  ],
  "published": "2024-07-05T06:55:29Z",
  "summary": "md/raid5: fix deadlock that raid5d() wait for itself to clear MD_SB_CHANGE_PENDING",
  "details": "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.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-39476"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b32aa95843cac6b12c2c014d40fca18aef24a347"
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      "url": "https://git.kernel.org/stable/c/634ba3c97ec413cb10681c7b196db43ee461ecf4"
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      "url": "https://git.kernel.org/stable/c/aa64464c8f4d2ab92f6d0b959a1e0767b829d787"
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      "url": "https://git.kernel.org/stable/c/098d54934814dd876963abfe751c3b1cf7fbe56a"
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      "url": "https://git.kernel.org/stable/c/3f8d5e802d4cedd445f9a89be8c3fd2d0e99024b"
    },
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      "url": "https://git.kernel.org/stable/c/cd2538e5af495b3c747e503db346470fc1ffc447"
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      "url": "https://git.kernel.org/stable/c/e332a12f65d8fed8cf63bedb4e9317bb872b9ac7"
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    "upstream_modified": "2026-05-24T06:48:58Z"
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}