{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "45919fbfe1c487c17ea1d198534339a5e8abeae3"
            },
            {
              "fixed": "8e839ed5210399a0330a8a6c5885c1d40a537c6d"
            },
            {
              "fixed": "88d806d0e1d36246208386a8e55b511c1b3d647c"
            },
            {
              "fixed": "3945ce8cbce4e328e6fdf0b522dc71e340de19db"
            },
            {
              "fixed": "65cae82fd3c39b53430672cb9e3ecd267471a6ce"
            },
            {
              "fixed": "c70994c2862b05e44728912b2ea9487d31e2aea7"
            },
            {
              "fixed": "7e7fff51808237703a3a1df6dd5cae1dfd1db86d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.5.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90185.json"
  },
  "details": "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's 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()'s 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's setup and with each other.",
  "id": "CVE-2026-90185",
  "modified": "2026-09-18T03:30:28.756266971Z",
  "published": "2026-09-17T16:07:08.392Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3945ce8cbce4e328e6fdf0b522dc71e340de19db"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65cae82fd3c39b53430672cb9e3ecd267471a6ce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e7fff51808237703a3a1df6dd5cae1dfd1db86d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88d806d0e1d36246208386a8e55b511c1b3d647c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e839ed5210399a0330a8a6c5885c1d40a537c6d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c70994c2862b05e44728912b2ea9487d31e2aea7"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90185.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90185"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "null_blk: serialize configfs attribute stores with the lock"
}