{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "49c3b9266a718dbd73c42e004288b4bb2ea0ac0b"
            },
            {
              "fixed": "f9f4ca45c770b7eec83fea6c9b727b26e691b513"
            },
            {
              "fixed": "349903f7ee72f7ac5b7a98840d701b2082d140a3"
            },
            {
              "fixed": "0a8c2f7b95981913ac370683e34db4906970c210"
            },
            {
              "fixed": "c7dea90c9b4ef1dfbd2e4df36de180c76fd7c33c"
            },
            {
              "fixed": "234117949da3b3f9705a21b66094f9f30bbe681d"
            },
            {
              "fixed": "017dac7670909eaea3eb36e6b3b5a8be9ce0a14d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.19.0"
            },
            {
              "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-2026-90190.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnull_blk: use DEFINE_MUTEX for the file-scope mutex\n\nIn null_init(), mutex_init(\u0026lock) currently happens after\nconfigfs_register_subsystem(), which exposes the nullb subsystem to\nuserspace. A racing mkdir() into /sys/kernel/config/nullb/ can reach\nnull_find_dev_by_name() -\u003e mutex_lock(\u0026lock) before the mutex is\ninitialized, trigger warning:\n\n[  123.137788] DEBUG_LOCKS_WARN_ON(lock-\u003emagic != lock)\n[  123.137796] WARNING: kernel/locking/mutex.c:159 at mutex_lock+0x171/0x1c0, CPU#13: mkdir/1301\n[  123.140090] Modules linked in: null_blk(+) nft_fib_inet nft_fib_ipv4\n......\n[  123.154926] Call Trace:\n[  123.155172]  \u003cTASK\u003e\n[  123.155419]  ? __pfx_mutex_lock+0x10/0x10\n[  123.156181]  ? __pfx__raw_spin_lock+0x10/0x10\n[  123.156571]  nullb_group_make_group+0x20/0x100 [null_blk]\n[  123.157011]  configfs_mkdir+0x47b/0xc70\n[  123.157337]  ? __pfx_configfs_mkdir+0x10/0x10\n[  123.157719]  ? may_create_dentry+0x242/0x2e0\n[  123.158061]  vfs_mkdir+0x2a9/0x6c0\n[  123.158352]  filename_mkdirat+0x3dc/0x500\n[  123.158710]  ? __pfx_filename_mkdirat+0x10/0x10\n[  123.159070]  ? strncpy_from_user+0x3a/0x1d0\n[  123.159413]  __x64_sys_mkdir+0x6b/0x90\n[  123.159760]  do_syscall_64+0xea/0x600\n\nReplace the runtime mutex_init(\u0026lock) with a static DEFINE_MUTEX(lock)\ndeclaration to fix this issue.",
  "id": "CVE-2026-90190",
  "modified": "2026-09-19T03:30:46.406113551Z",
  "published": "2026-09-17T16:07:11.654Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/017dac7670909eaea3eb36e6b3b5a8be9ce0a14d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a8c2f7b95981913ac370683e34db4906970c210"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/234117949da3b3f9705a21b66094f9f30bbe681d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/349903f7ee72f7ac5b7a98840d701b2082d140a3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c7dea90c9b4ef1dfbd2e4df36de180c76fd7c33c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f9f4ca45c770b7eec83fea6c9b727b26e691b513"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90190.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90190"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "null_blk: use DEFINE_MUTEX for the file-scope mutex"
}