CVE-2025-40125

Description

In the Linux kernel, the following vulnerability has been resolved:blk-mq: check kobject state_in_sysfs before deleting in blk_mq_unregister_hctxIn __blk_mq_update_nr_hw_queues() the return value ofblk_mq_sysfs_register_hctxs() is not checked. If sysfs creation for hctxfails, later changing the number of hw_queues or removing disk willtrigger 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.

Risk Information

Base Score

5.5

MODERATE

Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Score

Exploitation Probability

0.053

Associated Vulnerability

No records found

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234