412 lines
19 KiB
JSON
412 lines
19 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-39476",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-06-25T14:23:23.746Z",
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"datePublished": "2024-07-05T06:55:06.559Z",
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"dateUpdated": "2026-05-23T15:50:14.107Z"
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},
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"containers": {
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-05-23T15:50:14.107Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"drivers/md/raid5.c"
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"title": "md/raid5: fix deadlock that raid5d() wait for itself to clear MD_SB_CHANGE_PENDING",
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"timestamp": "2024-07-08T15:14:06.487642Z",
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"id": "CVE-2024-39476",
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