CVE-2025-40125 (GCVE-0-2025-40125)

Vulnerability from cvelistv5 – Published: 2025-11-12 10:23 – Updated: 2026-05-11 21:43
VLAI
Title
blk-mq: check kobject state_in_sysfs before deleting in blk_mq_unregister_hctx
Summary
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 477e19dedc9d3e1f4443a1d4ae00572a988120ea , < a8c53553f1833cc2d14175d2d72cf37193a01898 (git)
Affected: 477e19dedc9d3e1f4443a1d4ae00572a988120ea , < cc14ea21c4e658814d737ed4dedde6cd626a15ad (git)
Affected: 477e19dedc9d3e1f4443a1d4ae00572a988120ea , < 4b97e99b87a773d52699521d40864f3ec888e9a6 (git)
Affected: 477e19dedc9d3e1f4443a1d4ae00572a988120ea , < 6e7dadc5763c48eb3b9b91265a21f312599ebb2c (git)
Affected: 477e19dedc9d3e1f4443a1d4ae00572a988120ea , < 06c4826b1d900611096e4621e93133db57e13911 (git)
Affected: 477e19dedc9d3e1f4443a1d4ae00572a988120ea , < babc634e9fe2803962dba98a07587e835dbc0731 (git)
Affected: 477e19dedc9d3e1f4443a1d4ae00572a988120ea , < d5ddd76ee52bdc16e9f8b1e7791291e785dab032 (git)
Affected: 477e19dedc9d3e1f4443a1d4ae00572a988120ea , < 4c7ef92f6d4d08a27d676e4c348f4e2922cab3ed (git)
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Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.4.301 , ≤ 5.4.* (semver)
Unaffected: 5.10.246 , ≤ 5.10.* (semver)
Unaffected: 5.15.195 , ≤ 5.15.* (semver)
Unaffected: 6.1.156 , ≤ 6.1.* (semver)
Unaffected: 6.6.112 , ≤ 6.6.* (semver)
Unaffected: 6.12.53 , ≤ 6.12.* (semver)
Unaffected: 6.17.3 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "programFiles": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:43:15.313Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/4b97e99b87a773d52699521d40864f3ec888e9a6"
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        {
          "url": "https://git.kernel.org/stable/c/6e7dadc5763c48eb3b9b91265a21f312599ebb2c"
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        {
          "url": "https://git.kernel.org/stable/c/d5ddd76ee52bdc16e9f8b1e7791291e785dab032"
        },
        {
          "url": "https://git.kernel.org/stable/c/4c7ef92f6d4d08a27d676e4c348f4e2922cab3ed"
        }
      ],
      "title": "blk-mq: check kobject state_in_sysfs before deleting in blk_mq_unregister_hctx",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40125",
    "datePublished": "2025-11-12T10:23:20.180Z",
    "dateReserved": "2025-04-16T07:20:57.169Z",
    "dateUpdated": "2026-05-11T21:43:15.313Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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  "vulnerability-lookup:meta": {
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      "date": "2026-10-29",
      "epss": "0.00225",
      "percentile": "0.1318"
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                  {
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                    "status": "unaffected",
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                    "versionType": "semver"
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                    "versionType": "semver"
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                    "versionType": "original_commit_for_fix"
                  }
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              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nblk-mq: verificar el estado kobject state_in_sysfs antes de eliminar en blk_mq_unregister_hctx\n\nEn __blk_mq_update_nr_hw_queues() no se verifica el valor de retorno de blk_mq_sysfs_register_hctxs(). Si la creaci\u00f3n de sysfs para hctx falla, cambiar posteriormente el n\u00famero de hw_queues o eliminar el disco activar\u00e1 la siguiente advertencia:\n\n  kernfs: no se puede eliminar \u0027nr_tags\u0027, no hay directorio\n  ADVERTENCIA: CPU: 2 PID: 637 en fs/kernfs/dir.c:1707 kernfs_remove_by_name_ns+0x13f/0x160\n  Rastreo de llamadas:\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() fue llamado incondicionalmente incluso si la creaci\u00f3n de sysfs fall\u00f3. Corregirlo verificando el estado de creaci\u00f3n del kobject antes de eliminarlo."
          }
        ],
        "id": "CVE-2025-40125",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {},
        "published": "2025-11-12T11:15:42.043",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/06c4826b1d900611096e4621e93133db57e13911"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4b97e99b87a773d52699521d40864f3ec888e9a6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4c7ef92f6d4d08a27d676e4c348f4e2922cab3ed"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6e7dadc5763c48eb3b9b91265a21f312599ebb2c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a8c53553f1833cc2d14175d2d72cf37193a01898"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/babc634e9fe2803962dba98a07587e835dbc0731"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/cc14ea21c4e658814d737ed4dedde6cd626a15ad"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d5ddd76ee52bdc16e9f8b1e7791291e785dab032"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:28:02+00:00",
      "cve": "CVE-2025-40125",
      "id": "CVE-2025-40125",
      "initial_release_date": "2025-11-12T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: blk-mq: check kobject state_in_sysfs before deleting in blk_mq_unregister_hctx",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40125.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.