CVE-2024-26671blk-mq: fix IO hang from sbitmap wakeup race
Updated under an hour ago ()
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It affects Linux and 8 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 4.7 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from da55f2cc78418dee88400aafbbaed19d7ac8188e before 9525b38180e2753f0daa1a522b7767a2aa969676; from da55f2cc78418dee88400aafbbaed19d7ac8188e before ecd7744a1446eb02ccc63e493e2eb6ede4ef1e10; from da55f2cc78418dee88400aafbbaed19d7ac8188e before 7610ba1319253225a9ba8a9d28d472fc883b4e2f; from da55f2cc78418dee88400aafbbaed19d7ac8188e before 89e0e66682e1538aeeaa3109503473663cd24c8b; from da55f2cc78418dee88400aafbbaed19d7ac8188e before 1d9c777d3e70bdc57dddf7a14a80059d65919e56; from da55f2cc78418dee88400aafbbaed19d7ac8188e before 6d8b01624a2540336a32be91f25187a433af53a0; from da55f2cc78418dee88400aafbbaed19d7ac8188e before f1bc0d8163f8ee84a8d5affdf624cfad657df1d2; from da55f2cc78418dee88400aafbbaed19d7ac8188e before 5266caaf5660529e3da53004b8b7174cab6374ed | CNA record |
Siemens RUGGEDCOM RST2428P siemens:ruggedcom_rst2428p (from the name) | all versions not affected | CISA ADP |
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family siemens:scalance_xc_300_xr_300_xc_400_xr_500wg_xr_500_family (from the name) | all versions not affected | CISA ADP |
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family siemens:scalance_xcm_xrm_xch_xrh_300_family (from the name) | all versions not affected | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
linux linux_kernel linux:linux_kernel | before 4.19.307; from 4.20 before 5.4.269; from 5.5 before 5.10.210; from 5.11 before 5.15.149; from 5.16 before 6.1.77; from 6.2 before 6.7.4 | NVD |
debian debian_linux debian:debian_linux | 10.0 | NVD |
References
- https://git.kernel.org/stable/c/9525b38180e2753f0daa1a522b7767a2aa969676patch
- https://git.kernel.org/stable/c/ecd7744a1446eb02ccc63e493e2eb6ede4ef1e10patch
- https://git.kernel.org/stable/c/7610ba1319253225a9ba8a9d28d472fc883b4e2fpatch
- https://git.kernel.org/stable/c/89e0e66682e1538aeeaa3109503473663cd24c8bpatch
- https://git.kernel.org/stable/c/1d9c777d3e70bdc57dddf7a14a80059d65919e56patch
- https://git.kernel.org/stable/c/6d8b01624a2540336a32be91f25187a433af53a0patch
- https://git.kernel.org/stable/c/f1bc0d8163f8ee84a8d5affdf624cfad657df1d2patch
- https://git.kernel.org/stable/c/5266caaf5660529e3da53004b8b7174cab6374edpatch
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlmailing-list
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.htmlmailing-list
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://cert-portal.siemens.com/productcert/html/ssa-613116.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.