CVE-2024-26671

2024-04-0200:00:00

ubuntu.com

linux kernel

blk-mq

vulnerability

io hang

sbitmap wakeup race

7.5 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

13.2%

JSON

In the Linux kernel, the following vulnerability has been resolved: blk-mq:
fix IO hang from sbitmap wakeup race In blk_mq_mark_tag_wait(),
__add_wait_queue() may be re-ordered with the following
blk_mq_get_driver_tag() in case of getting driver tag failure. Then in
__sbitmap_queue_wake_up(), waitqueue_active() may not observe the added
waiter in blk_mq_mark_tag_wait() and wake up nothing, meantime
blk_mq_mark_tag_wait() can’t get driver tag successfully. This issue can be
reproduced by running the following test in loop, and fio hang can be
observed in < 30min when running it on my test VM in laptop. modprobe -r
scsi_debug modprobe scsi_debug delay=0 dev_size_mb=4096 max_queue=1
host_max_queue=1 submit_queues=4 dev=ls -d /sys/bus/pseudo/drivers/scsi_debug/adapter*/host*/target*/*/block/* | head -1 | xargs basename fio --filename=/dev/“$dev” --direct=1 --rw=randrw
–bs=4k --iodepth=1 \ –runtime=100 --numjobs=40 --time_based --name=test
–ioengine=libaio Fix the issue by adding one explicit barrier in
blk_mq_mark_tag_wait(), which is just fine in case of running out of tag.

Notes

Author	Note
rodrigo-zaiden	USN-6765-1 for linux-oem-6.5 wrongly stated that this CVE was fixed in version 6.5.0-1022.23. The mentioned notice was revoked and the state of the fix for linux-oem-6.5 was recovered to the previous state.

OSVersionArchitecturePackageVersionFilename
ubuntu20.04noarchlinux< 5.4.0-181.201UNKNOWN
ubuntu22.04noarchlinux< 5.15.0-106.116UNKNOWN
ubuntu23.10noarchlinux< 6.5.0-41.41UNKNOWN
ubuntu20.04noarchlinux-aws< 5.4.0-1124.134UNKNOWN
ubuntu22.04noarchlinux-aws< 5.15.0-1061.67UNKNOWN
ubuntu23.10noarchlinux-aws< 6.5.0-1021.21UNKNOWN
ubuntu20.04noarchlinux-aws-5.15< 5.15.0-1061.67~20.04.1UNKNOWN
ubuntu18.04noarchlinux-aws-5.4< 5.4.0-1124.134~18.04.1UNKNOWN
ubuntu22.04noarchlinux-aws-6.5< anyUNKNOWN
ubuntu20.04noarchlinux-azure< 5.4.0-1129.136UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	20.04	noarch	linux	< 5.4.0-181.201	UNKNOWN
ubuntu	22.04	noarch	linux	< 5.15.0-106.116	UNKNOWN
ubuntu	23.10	noarch	linux	< 6.5.0-41.41	UNKNOWN
ubuntu	20.04	noarch	linux-aws	< 5.4.0-1124.134	UNKNOWN
ubuntu	22.04	noarch	linux-aws	< 5.15.0-1061.67	UNKNOWN
ubuntu	23.10	noarch	linux-aws	< 6.5.0-1021.21	UNKNOWN
ubuntu	20.04	noarch	linux-aws-5.15	< 5.15.0-1061.67~20.04.1	UNKNOWN
ubuntu	18.04	noarch	linux-aws-5.4	< 5.4.0-1124.134~18.04.1	UNKNOWN
ubuntu	22.04	noarch	linux-aws-6.5	< any	UNKNOWN
ubuntu	20.04	noarch	linux-azure	< 5.4.0-1129.136	UNKNOWN