CVE-2025-40125

Not scored yetLast modified Oct 19, 2026

Description

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.

Metrics

No CVSS score has been published yet.

Affected software

VendorProductVersions
LinuxLinux>= 477e19dedc9d3e1f4443a1d4ae00572a988120ea, < a8c53553f1833cc2d14175d2d72cf37193a01898; >= 477e19dedc9d3e1f4443a1d4ae00572a988120ea, < cc14ea21c4e658814d737ed4dedde6cd626a15ad; >= 477e19dedc9d3e1f4443a1d4ae00572a988120ea, < 4b97e99b87a773d52699521d40864f3ec888e9a6; >= 477e19dedc9d3e1f4443a1d4ae00572a988120ea, < 6e7dadc5763c48eb3b9b91265a21f312599ebb2c; >= 477e19dedc9d3e1f4443a1d4ae00572a988120ea, < 06c4826b1d900611096e4621e93133db57e13911; >= 477e19dedc9d3e1f4443a1d4ae00572a988120ea, < babc634e9fe2803962dba98a07587e835dbc0731; >= 477e19dedc9d3e1f4443a1d4ae00572a988120ea, < d5ddd76ee52bdc16e9f8b1e7791291e785dab032; >= 477e19dedc9d3e1f4443a1d4ae00572a988120ea, < 4c7ef92f6d4d08a27d676e4c348f4e2922cab3ed
LinuxLinux4.20

References

Timeline

Published
Nov 12, 2025
Last modified
Oct 19, 2026
NVD status
Deferred

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CVE-2025-40125: Unscored | Vulnix