# CVE-2025-40125: linux: In the Linux kernel, the following vulnerability has been resolved: blk-mq: check kobject state_in_sysfs before dele... CVE-2025-40125 is fixed in 64 products on 1 platform, first by ALAS2023-2025-1253, released October 27, 2025. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2025-40125 - Priority: Routine - CVSS: 5.5 (IMPORTANT) - EPSS: 0.0023 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Oct 27, 2025 ## 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | bpftool ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | bpftool ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | bpftool-debuginfo amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | bpftool6.12 amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | bpftool6.12-debuginfo amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | kernel-debuginfo amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | kernel-devel amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | kernel-headers amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | kernel-libbpf amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | kernel-libbpf-debuginfo amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | kernel-libbpf-devel amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | kernel-libbpf-static amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | kernel-livepatch-6.1.156-177.286 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | kernel-livepatch-6.12.53-69.119 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel-modules-extra amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | kernel-modules-extra-common amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | kernel-tools amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | kernel-tools-debuginfo amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | kernel-tools-devel amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | kernel-uek ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-container ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-container ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-container-debug ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-container-debug ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-core ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-core ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-debug ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-debug ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-debug-core ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-debug-core ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-debug-devel ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-debug-devel ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-debug-modules ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-debug-modules ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-debug-modules-extra ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-debug-modules-extra ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-devel ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-devel ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-doc ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-doc ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-modules ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-modules ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-modules-extra ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-modules-extra ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek-tools ol 8 | 0:5.4.17-2136.350.3.1.el7uek | [ELSA-2025-28049](https://patchblox.com/security/data/fix/linux/elsa-2025-28049.md) | Dec 12, 2025 | | Linux | kernel-uek64k ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek64k ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek64k-core ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek64k-core ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek64k-devel ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek64k-devel ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek64k-modules ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek64k-modules ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek64k-modules-extra ol 8 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel-uek64k-modules-extra ol 9 | 0:5.15.0-315.196.5.1.el9uek | [ELSA-2025-28048](https://patchblox.com/security/data/fix/linux/elsa-2025-28048.md) | Dec 12, 2025 | | Linux | kernel6.12 amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-debuginfo amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-debuginfo-common-aarch64 amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-debuginfo-common-x86_64 amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-devel amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-headers amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-libbpf amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-libbpf-debuginfo amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-libbpf-devel amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-libbpf-static amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-modules-extra amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-modules-extra-common amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-tools amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-tools-debuginfo amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-tools-devel amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | linux Debian 12.15 (bookworm) | 6.1.158-1 | [DEBIAN-CVE-2025-40125](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40125.md) | Nov 12, 2025 | | Linux | linux Debian 13.5 (trixie) | 6.12.57-1 | [DEBIAN-CVE-2025-40125](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40125.md) | Nov 12, 2025 | | Linux | linux Debian 14 | 6.17.6-1 | [DEBIAN-CVE-2025-40125](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40125.md) | Nov 12, 2025 | | Linux | perf amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | perf-debuginfo amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | perf6.12 amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | perf6.12-debuginfo amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | python3-perf amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | python3-perf-debuginfo amzn 2023 | 1:6.1.156-177.286.amzn2023 | [ALAS2023-2025-1253](https://patchblox.com/security/data/fix/linux/alas2023-2025-1253.md) | Oct 27, 2025 | | Linux | python3-perf6.12 amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | python3-perf6.12-debuginfo amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | --- Data as of 2026-11-09T01:18:40Z UTC. 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