CVE-2024-26671

CVE Details

Release Date:

2024-04-02

Description

In the Linux kernel, the following vulnerability has been resolved:\nblk-mq: fix IO hang from sbitmap wakeup race\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.\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.\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.\nmodprobe -r scsi_debug\nmodprobe scsi_debug delay=0 dev_size_mb=4096 max_queue=1 host_max_queue=1 submit_queues=4\ndev=`ls -d /sys/bus/pseudo/drivers/scsi_debug/adapter*/host*/target*/*/block/* | head -1 | xargs basename`\nfio --filename=/dev/\\ --direct=1 --rw=randrw --bs=4k --iodepth=1 \\n--runtime=100 --numjobs=40 --time_based --name=test \\n--ioengine=libaio\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.

See more information about CVE-2024-26671 from MITRE CVE dictionary and NIST NVD

CVSS v3.0 metrics

NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.

Base Score:	4.4	Base Metrics:	AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Access Vector:	Local network	Attack Complexity:	Low
Privileges Required:	High	User Interaction:	None
Scope:	Unchanged	Confidentiality Impact:	None
Integrity Impact:	None	Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (kernel)	ELSA-2024-3138	2024-05-23

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