CVE-2026-90187 (GCVE-0-2026-90187)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:07 – Updated: 2026-09-17 16:07
VLAI
Title
null_blk: free zones array on device power-off
Summary
In the Linux kernel, the following vulnerability has been resolved: null_blk: free zones array on device power-off null_init_zoned_dev() allocates dev->zones when a zoned device is powered on, but null_del_dev() never frees it on power-off; dev->zones is only freed later in null_free_dev(), when the configfs directory is removed. If the device is powered off and then on again, null_init_zoned_dev() allocates a new array and overwrites the dev->zones pointer, leaking the previous allocation each power cycle. Free dev->zones in null_del_dev() via null_free_zoned_dev() to solve it. And calling null_free_zoned_dev() in null_free_dev() is no longer necessary because every caller already invokes null_del_dev() first: via nullb_group_drop_item() before nullb_device_release(), in the null_add_dev() error path of null_create_dev(), and in null_destroy_dev(). Remove the redundant call. And take &lock around zone_cond_store() in the two store wrappers to serialize dev->zones check-and-deref against its alloc/free, which already run under &lock. The reason there was no problem before is that only nullb_device_release() or null_exit() frees the dev->zones, which guarantees that subsequent users won't access the configfs interface.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ca4b2a011948fae4e4d31490107db4926385a983 , < 056be41932c95aabdb3c2967d1ef4978f17a0225 (git)
Affected: ca4b2a011948fae4e4d31490107db4926385a983 , < b2437d37fcc31fce8a5da1cc1739e284814d2491 (git)
Affected: ca4b2a011948fae4e4d31490107db4926385a983 , < 0a3afab87124171022fb3579502fa38ef5b311c9 (git)
Affected: ca4b2a011948fae4e4d31490107db4926385a983 , < 2a6357a9b935a34f5508618fee8a7fffbf7722a8 (git)
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Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/block/null_blk/main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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      "cpeApplicability": [
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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\nnull_blk: free zones array on device power-off\n\nnull_init_zoned_dev() allocates dev-\u003ezones when a zoned device is powered\non, but null_del_dev() never frees it on power-off; dev-\u003ezones is only\nfreed later in null_free_dev(), when the configfs directory is removed. If\nthe device is powered off and then on again, null_init_zoned_dev()\nallocates a new array and overwrites the dev-\u003ezones pointer, leaking the\nprevious allocation each power cycle.\n\nFree dev-\u003ezones in null_del_dev() via null_free_zoned_dev() to solve it.\nAnd calling null_free_zoned_dev() in null_free_dev() is no longer necessary\nbecause every caller already invokes null_del_dev() first: via\nnullb_group_drop_item() before nullb_device_release(), in the\nnull_add_dev() error path of null_create_dev(), and in null_destroy_dev().\nRemove the redundant call.\n\nAnd take \u0026lock around zone_cond_store() in the two store wrappers to\nserialize dev-\u003ezones check-and-deref against its alloc/free, which already\nrun under \u0026lock. The reason there was no problem before is that only\nnullb_device_release() or null_exit() frees the dev-\u003ezones, which\nguarantees that subsequent users won\u0027t access the configfs interface."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:07:09.683Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/056be41932c95aabdb3c2967d1ef4978f17a0225"
        },
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          "url": "https://git.kernel.org/stable/c/0a3afab87124171022fb3579502fa38ef5b311c9"
        },
        {
          "url": "https://git.kernel.org/stable/c/2a6357a9b935a34f5508618fee8a7fffbf7722a8"
        }
      ],
      "title": "null_blk: free zones array on device power-off",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90187",
    "datePublished": "2026-09-17T16:07:09.683Z",
    "dateReserved": "2026-09-11T19:38:34.791Z",
    "dateUpdated": "2026-09-17T16:07:09.683Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
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      "date": "2026-09-25",
      "epss": "0.00209",
      "percentile": "0.09874"
    },
    "nvd": {
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnull_blk: free zones array on device power-off\n\nnull_init_zoned_dev() allocates dev-\u003ezones when a zoned device is powered\non, but null_del_dev() never frees it on power-off; dev-\u003ezones is only\nfreed later in null_free_dev(), when the configfs directory is removed. If\nthe device is powered off and then on again, null_init_zoned_dev()\nallocates a new array and overwrites the dev-\u003ezones pointer, leaking the\nprevious allocation each power cycle.\n\nFree dev-\u003ezones in null_del_dev() via null_free_zoned_dev() to solve it.\nAnd calling null_free_zoned_dev() in null_free_dev() is no longer necessary\nbecause every caller already invokes null_del_dev() first: via\nnullb_group_drop_item() before nullb_device_release(), in the\nnull_add_dev() error path of null_create_dev(), and in null_destroy_dev().\nRemove the redundant call.\n\nAnd take \u0026lock around zone_cond_store() in the two store wrappers to\nserialize dev-\u003ezones check-and-deref against its alloc/free, which already\nrun under \u0026lock. The reason there was no problem before is that only\nnullb_device_release() or null_exit() frees the dev-\u003ezones, which\nguarantees that subsequent users won\u0027t access the configfs interface."
          }
        ],
        "id": "CVE-2026-90187",
        "lastModified": "2026-09-17T17:17:13.270",
        "metrics": {},
        "published": "2026-09-17T17:17:13.270",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "vulnStatus": "Received"
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      "current_release_date": "2026-09-21T16:31:16Z",
      "cve": "CVE-2026-90187",
      "id": "CVE-2026-90187",
      "initial_release_date": "2026-09-21T16:31:16Z",
      "product_status:known_affected": "254",
      "product_status:known_not_affected": "93",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90187",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-90187.json",
      "version": "2"
    }
  }
}



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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.

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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.
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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.



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.