{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "172da89ed0eaf9d9348f5decb86ad04c624b39d1"
            },
            {
              "fixed": "0e501fd0f38e42304bfa0d46a812d93f80294a87"
            },
            {
              "fixed": "106ab66cf5467726ca5ead51623043d37c06820a"
            },
            {
              "fixed": "1b6074112742f65ece71b0f299ca5a6a887d2db6"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50307.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/cio: fix out-of-bounds access on cio_ignore free\n\nThe channel-subsystem-driver scans for newly available devices whenever\ndevice-IDs are removed from the cio_ignore list using a command such as:\n\n  echo free \u003e/proc/cio_ignore\n\nSince an I/O device scan might interfer with running I/Os, commit\n172da89ed0ea (\"s390/cio: avoid excessive path-verification requests\")\nintroduced an optimization to exclude online devices from the scan.\n\nThe newly added check for online devices incorrectly assumes that\nan I/O-subchannel's drvdata points to a struct io_subchannel_private.\nFor devices that are bound to a non-default I/O subchannel driver, such\nas the vfio_ccw driver, this results in an out-of-bounds read access\nduring each scan.\n\nFix this by changing the scan logic to rely on a driver-independent\nonline indication. For this we can use struct subchannel-\u003econfig.ena,\nwhich is the driver's requested subchannel-enabled state. Since I/Os\ncan only be started on enabled subchannels, this matches the intent\nof the original optimization of not scanning devices where I/O might\nbe running.",
  "id": "CVE-2022-50307",
  "modified": "2026-04-01T23:08:46.224821882Z",
  "published": "2025-09-15T14:46:02.608Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e501fd0f38e42304bfa0d46a812d93f80294a87"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/106ab66cf5467726ca5ead51623043d37c06820a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b6074112742f65ece71b0f299ca5a6a887d2db6"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50307.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50307"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.3",
  "summary": "s390/cio: fix out-of-bounds access on cio_ignore free"
}