Not yet scoredPublished Nov 12, 2025

CVE-2025-40125blk-mq: check kobject state_in_sysfs before deleting in blk_mq_unregister_hctx

Updated under an hour ago (Oct 27, 2026, 8:40 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: blk-mq: check kobject state_in_sysfs before deleting in blk_mq_unregister_hctx In __blk_mq_update_nr_hw_queues() the return value of blk_mq_sysfs_register_hctxs() is not checked. If sysfs creation for hctx fails, later changing the number of hw_queues or removing disk will trigger the following warning: kernfs: can not remove 'nr_tags', no directory WARNING: CPU: 2 PID: 637 at fs/kernfs/dir.c:1707 kernfs_remove_by_name_ns+0x13f/0x160 Call Trace: remove_files.isra.1+0x38/0xb0 sysfs_remove_group+0x4d/0x100 sysfs_remove_groups+0x31/0x60 __kobject_del+0x23/0xf0 kobject_del+0x17/0x40 blk_mq_unregister_hctx+0x5d/0x80 blk_mq_sysfs_unregister_hctxs+0x94/0xd0 blk_mq_update_nr_hw_queues+0x124/0x760 nullb_update_nr_hw_queues+0x71/0xf0 [null_blk] nullb_device_submit_queues_store+0x92/0x120 [null_blk] kobjct_del() was called unconditionally even if sysfs creation failed. Fix it by checkig the kobject creation statusbefore deleting it.

CVSS: Not yet scored
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: Deferred
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 477e19dedc9d3e1f4443a1d4ae00572a988120ea before a8c53553f1833cc2d14175d2d72cf37193a01898; from 477e19dedc9d3e1f4443a1d4ae00572a988120ea before cc14ea21c4e658814d737ed4dedde6cd626a15ad; 477e19dedc9d3e1f4443a1d4ae00572a988120ea builds before 4b97e99b87a773d52699521d40864f3ec888e9a6; 477e19dedc9d3e1f4443a1d4ae00572a988120ea builds before 6e7dadc5763c48eb3b9b91265a21f312599ebb2c; 477e19dedc9d3e1f4443a1d4ae00572a988120ea builds before 06c4826b1d900611096e4621e93133db57e13911; from 477e19dedc9d3e1f4443a1d4ae00572a988120ea before babc634e9fe2803962dba98a07587e835dbc0731; from 477e19dedc9d3e1f4443a1d4ae00572a988120ea before d5ddd76ee52bdc16e9f8b1e7791291e785dab032; 477e19dedc9d3e1f4443a1d4ae00572a988120ea builds before 4c7ef92f6d4d08a27d676e4c348f4e2922cab3ed	CNA record

References

References

https://git.kernel.org/stable/c/a8c53553f1833cc2d14175d2d72cf37193a01898
https://git.kernel.org/stable/c/cc14ea21c4e658814d737ed4dedde6cd626a15ad
https://git.kernel.org/stable/c/4b97e99b87a773d52699521d40864f3ec888e9a6
https://git.kernel.org/stable/c/6e7dadc5763c48eb3b9b91265a21f312599ebb2c
https://git.kernel.org/stable/c/06c4826b1d900611096e4621e93133db57e13911
https://git.kernel.org/stable/c/babc634e9fe2803962dba98a07587e835dbc0731
https://git.kernel.org/stable/c/d5ddd76ee52bdc16e9f8b1e7791291e785dab032
https://git.kernel.org/stable/c/4c7ef92f6d4d08a27d676e4c348f4e2922cab3ed

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.