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

Vulnerability from cvelistv5 – Published: 2025-11-12 10:23 – Updated: 2025-12-01 06:18
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
References
Impacted products
Vendor Product Version
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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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "block/blk-mq-sysfs.c"
          ],
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          "vendor": "Linux",
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              "versionType": "git"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "status": "unaffected",
              "version": "5.4.301",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.10.246",
              "versionType": "semver"
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              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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              "negate": false,
              "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": "2025-12-01T06:18:30.912Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a8c53553f1833cc2d14175d2d72cf37193a01898"
        },
        {
          "url": "https://git.kernel.org/stable/c/cc14ea21c4e658814d737ed4dedde6cd626a15ad"
        },
        {
          "url": "https://git.kernel.org/stable/c/4b97e99b87a773d52699521d40864f3ec888e9a6"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e7dadc5763c48eb3b9b91265a21f312599ebb2c"
        },
        {
          "url": "https://git.kernel.org/stable/c/06c4826b1d900611096e4621e93133db57e13911"
        },
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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": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40125",
    "datePublished": "2025-11-12T10:23:20.180Z",
    "dateReserved": "2025-04-16T07:20:57.169Z",
    "dateUpdated": "2025-12-01T06:18:30.912Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40125\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-11-12T11:15:42.043\",\"lastModified\":\"2025-11-12T16:19:12.850\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • 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.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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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