What is CVE-2025-40125?

CVE-2025-40125 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 4.20 onward and patched in 5.4.301, 5.10.246, 5.15.195 and others. CVE-2025-40125 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-40125?

CVE-2025-40125 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2025-40125?

Yes, CVE-2025-40125 has been patched. Fixed versions include 5.4.301, 5.10.246, 5.15.195 and others. If you are running Linux kernel 4.20 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-40125 actively exploited?

CVE-2025-40125 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-40125

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.

Package Linux Kernel

Published 2025-11-12

Last modified 2026-04-15

Patch available

Yes

Affected versions

Linux kernel versions 4.20 and later are affected. Fixed in 5.4.301, 5.10.246, 5.15.195, 6.1.156, 6.6.112, 6.12.53, 6.17.3, 6.18 and their respective stable series.

Affected from

≥ 4.20

Fixed in

✓ 5.4.301 5.4.x ✓ 5.10.246 5.10.x ✓ 5.15.195 5.15.x ✓ 6.1.156 6.1.x ✓ 6.6.112 6.6.x ✓ 6.12.53 6.12.x ✓ 6.17.3 6.17.x ✓ 6.18

References

The following references provide additional information about CVE-2025-40125 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/06c4826b1d900611096e4621e93133db57e13911
Patch
Kernel patch commit
https://git.kernel.org/stable/c/4b97e99b87a773d52699521d40864f3ec888e9a6
Patch
Kernel patch commit
https://git.kernel.org/stable/c/4c7ef92f6d4d08a27d676e4c348f4e2922cab3ed
Patch

8 patch commits total View all on NVD

Frequently asked questions

What is CVE-2025-40125?

CVE-2025-40125 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.20 onward and has been patched in 5.4.301, 5.10.246, 5.15.195 and others. CVE-2025-40125 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2025-40125?

Yes — CVE-2025-40125 has been patched. Fixed versions include 5.4.301, 5.10.246, 5.15.195 and others. If you are running Linux kernel 4.20 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-40125 actively exploited?

No — CVE-2025-40125 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.