ghsa-8mqf-xr44-qqq9
Vulnerability from github
Published
2025-11-12 12:30
Modified
2025-11-12 12:30
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-40125"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-11-12T11:15:42Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-mq: check kobject state_in_sysfs before deleting in blk_mq_unregister_hctx\n\nIn __blk_mq_update_nr_hw_queues() the return value of\nblk_mq_sysfs_register_hctxs() is not checked. If sysfs creation for hctx\nfails, later changing the number of hw_queues or removing disk will\ntrigger the following warning:\n\n  kernfs: can not remove \u0027nr_tags\u0027, no directory\n  WARNING: CPU: 2 PID: 637 at fs/kernfs/dir.c:1707 kernfs_remove_by_name_ns+0x13f/0x160\n  Call Trace:\n   remove_files.isra.1+0x38/0xb0\n   sysfs_remove_group+0x4d/0x100\n   sysfs_remove_groups+0x31/0x60\n   __kobject_del+0x23/0xf0\n   kobject_del+0x17/0x40\n   blk_mq_unregister_hctx+0x5d/0x80\n   blk_mq_sysfs_unregister_hctxs+0x94/0xd0\n   blk_mq_update_nr_hw_queues+0x124/0x760\n   nullb_update_nr_hw_queues+0x71/0xf0 [null_blk]\n   nullb_device_submit_queues_store+0x92/0x120 [null_blk]\n\nkobjct_del() was called unconditionally even if sysfs creation failed.\nFix it by checkig the kobject creation statusbefore deleting it.",
  "id": "GHSA-8mqf-xr44-qqq9",
  "modified": "2025-11-12T12:30:27Z",
  "published": "2025-11-12T12:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40125"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06c4826b1d900611096e4621e93133db57e13911"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b97e99b87a773d52699521d40864f3ec888e9a6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c7ef92f6d4d08a27d676e4c348f4e2922cab3ed"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6e7dadc5763c48eb3b9b91265a21f312599ebb2c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a8c53553f1833cc2d14175d2d72cf37193a01898"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/babc634e9fe2803962dba98a07587e835dbc0731"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cc14ea21c4e658814d737ed4dedde6cd626a15ad"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5ddd76ee52bdc16e9f8b1e7791291e785dab032"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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