{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  s390/debug: Fix deadlock during unregister  Unregistering an s390dbf debug area while one of the associated debugfs files is being written to can cause a deadlock:  $ echo \u003e.../vmur/level    $ rmmod vmur =================================================== debugfs write debugfs_file_get()                           debug_unregister()                           mutex_lock(debug_mutex)                           debugfs_remove()                           wait for debugfs_file_put() debug_file_ops.write() debug_input() mutex_lock(debug_mutex) ==\u003e DEADLOCK  Fix this by splitting debug_unregister() into an s390dbf and debugfs part, and running only the s390dbf part with debug_mutex locked.",
  "id": "DEBIAN-CVE-2026-90209",
  "modified": "2026-09-18T04:47:33.777492055Z",
  "published": "2026-09-17T17:17:16.060Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-90209"
    }
  ],
  "upstream": [
    "CVE-2026-90209"
  ]
}