474 lines
21 KiB
JSON
474 lines
21 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2024-26671",
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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": "2024-02-19T14:20:24.150Z",
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"datePublished": "2024-04-02T06:49:13.834Z",
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"dateUpdated": "2026-10-15T00:38:25.988Z"
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"dateUpdated": "2026-05-11T20:01:56.325Z"
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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\nblk-mq: fix IO hang from sbitmap wakeup race\n\nIn blk_mq_mark_tag_wait(), __add_wait_queue() may be re-ordered\nwith the following blk_mq_get_driver_tag() in case of getting driver\ntag failure.\n\nThen in __sbitmap_queue_wake_up(), waitqueue_active() may not observe\nthe added waiter in blk_mq_mark_tag_wait() and wake up nothing, meantime\nblk_mq_mark_tag_wait() can't get driver tag successfully.\n\nThis issue can be reproduced by running the following test in loop, and\nfio hang can be observed in < 30min when running it on my test VM\nin laptop.\n\n\tmodprobe -r scsi_debug\n\tmodprobe scsi_debug delay=0 dev_size_mb=4096 max_queue=1 host_max_queue=1 submit_queues=4\n\tdev=`ls -d /sys/bus/pseudo/drivers/scsi_debug/adapter*/host*/target*/*/block/* | head -1 | xargs basename`\n\tfio --filename=/dev/\"$dev\" --direct=1 --rw=randrw --bs=4k --iodepth=1 \\\n \t\t--runtime=100 --numjobs=40 --time_based --name=test \\\n \t--ioengine=libaio\n\nFix the issue by adding one explicit barrier in blk_mq_mark_tag_wait(), which\nis just fine in case of running out of tag."
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}
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