CVE-2026-90185 (GCVE-0-2026-90185)
Vulnerability from cvelistv5
Published
2026-09-17 16:07
Modified
2026-10-19 08:59
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: null_blk: serialize configfs attribute stores with the lock The NULLB_DEVICE_ATTR _store takes no lock: apply_fn attributes (submit_queues, poll_queues) get dev->NAME written again after apply_fn returns, outside its lock; APPLY=NULL attributes are entirely lockless. configfs only serializes stores per-open-file, so concurrent stores on separate fds race. For apply_fn attributes, once one store's apply_fn has reconfigured the hardware, a second (losing) store can still overwrite dev->NAME afterwards. This leaves dev->submit_queues out of sync with the live queue count, which is later caught by the WARN_ON_ONCE() in null_map_queues(). For !apply_fn attributes, power_store()'s null_add_dev() validates and builds the device under "lock" but only sets CONFIGURED afterwards. A store slipping in during this window can change a field mid-setup -- for example, zone_nr_conv can be pushed above nr_zones after it has already been clamped, leading to an out-of-bounds dev->zones[] access. Take "lock" in the macro around the apply_fn call, the CONFIGURED test and the field write, and move it out of nullb_apply_submit_queues()/ nullb_apply_poll_queues() so both paths are covered once. This serializes stores with power_store's setup and with each other.
References
Impacted products
Vendor Product Version
Linux Linux Version: 45919fbfe1c487c17ea1d198534339a5e8abeae3
Version: 45919fbfe1c487c17ea1d198534339a5e8abeae3
Version: 45919fbfe1c487c17ea1d198534339a5e8abeae3
Version: 45919fbfe1c487c17ea1d198534339a5e8abeae3
Version: 45919fbfe1c487c17ea1d198534339a5e8abeae3
Version: 45919fbfe1c487c17ea1d198534339a5e8abeae3
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{
  "containers": {
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        {
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          "programFiles": [
            "drivers/block/null_blk/main.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "7.2.6",
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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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: serialize configfs attribute stores with the lock\n\nThe NULLB_DEVICE_ATTR _store takes no lock: apply_fn attributes\n(submit_queues, poll_queues) get dev-\u003eNAME written again after apply_fn\nreturns, outside its lock; APPLY=NULL attributes are entirely lockless.\nconfigfs only serializes stores per-open-file, so concurrent stores on\nseparate fds race.\n\nFor apply_fn attributes, once one store\u0027s apply_fn has reconfigured the\nhardware, a second (losing) store can still overwrite dev-\u003eNAME\nafterwards. This leaves dev-\u003esubmit_queues out of sync with the live\nqueue count, which is later caught by the WARN_ON_ONCE() in\nnull_map_queues().\n\nFor !apply_fn attributes, power_store()\u0027s null_add_dev() validates and\nbuilds the device under \"lock\" but only sets CONFIGURED afterwards. A store\nslipping in during this window can change a field mid-setup -- for example,\nzone_nr_conv can be pushed above nr_zones after it has already been\nclamped, leading to an out-of-bounds dev-\u003ezones[] access.\n\nTake \"lock\" in the macro around the apply_fn call, the CONFIGURED test and\nthe field write, and move it out of nullb_apply_submit_queues()/\nnullb_apply_poll_queues() so both paths are covered once. This serializes\nstores with power_store\u0027s setup and with each other."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:59:22.077Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8e839ed5210399a0330a8a6c5885c1d40a537c6d"
        },
        {
          "url": "https://git.kernel.org/stable/c/88d806d0e1d36246208386a8e55b511c1b3d647c"
        },
        {
          "url": "https://git.kernel.org/stable/c/3945ce8cbce4e328e6fdf0b522dc71e340de19db"
        },
        {
          "url": "https://git.kernel.org/stable/c/65cae82fd3c39b53430672cb9e3ecd267471a6ce"
        },
        {
          "url": "https://git.kernel.org/stable/c/c70994c2862b05e44728912b2ea9487d31e2aea7"
        },
        {
          "url": "https://git.kernel.org/stable/c/7e7fff51808237703a3a1df6dd5cae1dfd1db86d"
        }
      ],
      "title": "null_blk: serialize configfs attribute stores with the lock",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90185",
    "datePublished": "2026-09-17T16:07:08.392Z",
    "dateReserved": "2026-09-11T19:38:34.791Z",
    "dateUpdated": "2026-10-19T08:59:22.077Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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