CVE-2024-26671

NameCVE-2024-26671
DescriptionIn 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3840-1, DLA-3842-1, DSA-5681-1, ELA-1093-1, ELA-1116-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)jessie, jessie (lts)3.16.84-1vulnerable
stretch (security)4.9.320-2vulnerable
stretch (lts), stretch4.9.320-3vulnerable
buster (security), buster, buster (lts)4.19.316-1fixed
bullseye5.10.223-1fixed
bullseye (security)5.10.226-1fixed
bookworm6.1.106-3fixed
bookworm (security)6.1.112-1fixed
sid, trixie6.11.5-1fixed
linux-4.19 (PTS)jessie, jessie (lts)4.19.316-1~deb8u1fixed
stretch (security)4.19.232-1~deb9u1vulnerable
stretch (lts), stretch4.19.316-1~deb9u1fixed
linux-5.10 (PTS)jessie, jessie (lts)5.10.226-1~deb8u1fixed
stretch (lts), stretch5.10.226-1~deb9u1fixed
buster, buster (lts)5.10.226-1~deb10u1fixed
buster (security)5.10.218-1~deb10u1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsourcejessie(unfixed)end-of-life
linuxsourcestretch(unfixed)end-of-life
linuxsourcebuster4.19.316-1DLA-3840-1
linuxsourcebullseye5.10.216-1DSA-5681-1
linuxsourcebookworm6.1.82-1
linuxsource(unstable)6.7.7-1
linux-4.19sourcejessie4.19.316-1~deb8u1ELA-1116-1
linux-4.19sourcestretch4.19.316-1~deb9u1ELA-1116-1
linux-5.10sourcejessie5.10.216-1~deb8u1ELA-1093-1
linux-5.10sourcestretch5.10.216-1~deb9u1ELA-1093-1
linux-5.10sourcebuster5.10.216-1~deb10u1DLA-3842-1

Notes

https://git.kernel.org/linus/5266caaf5660529e3da53004b8b7174cab6374ed (6.8-rc1)

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