CVE-2025-40125

blk-mq: check kobject state_in_sysfs before deleting in blk_mq_unregister_hctx

Not available

At a glance

Source
NVD
EPSS
EPSS 0.22 % · percentile 13 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Deferred

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.

References

European references

CERT-FR advisories

Affected products

ProductVersions
Linux · Linuxaffected 477e19dedc9d3e1f4443a1d4ae00572a988120ea < a8c53553f1833cc2d14175d2d72cf37193a01898 ; affected 477e19dedc9d3e1f4443a1d4ae00572a988120ea < cc14ea21c4e658814d737ed4dedde6cd626a15ad ; affected 477e19dedc9d3e1f4443a1d4ae00572a988120ea < 4b97e99b87a773d52699521d40864f3ec888e9a6 ; affected 477e19dedc9d3e1f4443a1d4ae00572a988120ea < 6e7dadc5763c48eb3b9b91265a21f312599ebb2c ; affected 477e19dedc9d3e1f4443a1d4ae00572a988120ea < 06c4826b1d900611096e4621e93133db57e13911 ; affected 477e19dedc9d3e1f4443a1d4ae00572a988120ea < babc634e9fe2803962dba98a07587e835dbc0731
Linux · Linuxaffected 4.20 ; unaffected 0 < 4.20 ; unaffected 5.4.301 ≤ 5.4.* ; unaffected 5.10.246 ≤ 5.10.* ; unaffected 5.15.195 ≤ 5.15.* ; unaffected 6.1.156 ≤ 6.1.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD