{
  "cveId": "CVE-2026-93202",
  "url": "https://patchblox.com/security/cve/CVE-2026-93202",
  "summary": "CVE-2026-93202 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-93202, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "i3c: master: Fix recursive locking during device registration",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  i3c: master: Fix recursive locking during device registration  i3c_master_register_new_i3c_devs() registers newly discovered devices while holding i3c_bus_normaluse_lock(), a down_read().  device_register() can immediately probe the device, and probe callbacks typically invoke I3C helpers that take i3c_bus_normaluse_lock() again, leading to a recursive acquisition of the same rwsem.  rwsems do not support recursive read locking and can deadlock when a writer is waiting.  See the \u0022Recursive read locks\u0022 section of Documentation/locking/lockdep-design.rst.  For example, with Intel LPSS I3C, LOCKDEP generates a WARNING like:   # echo intel-lpss-i3c.0 \u003E /sys/bus/platform/drivers/mipi-i3c-hci/unbind   # echo intel-lpss-i3c.0 \u003E /sys/bus/platform/drivers/mipi-i3c-hci/bind   WARNING: possible recursive locking detected   kworker/5:1/94 is trying to acquire lock:   ffff88811c810d78 (\u0026i3cbus-\u003Elock){\u002B\u002B\u002B\u002B}-{4:4}, at: i3c_device_match_id\u002B0x45/0x370   but task is already holding lock:   ffff88811c810d78 (\u0026i3cbus-\u003Elock){\u002B\u002B\u002B\u002B}-{4:4}, at: i3c_master_reg_work_fn\u002B0x21/0x5f0  Fix this by separating device creation from device registration. Populate desc-\u003Edev under the maintenance lock, collect the devices that still need registration into a local list, then release the lock before calling device_register().  Finally retake the lock and clean up any devices that failed to register.  Use the maintenance lock rather than the normal-use lock while adding device objects.  A write-side maintenance lock prevents readers from observing a partially initialized desc-\u003Edev during initial device population, or desc-\u003Edev disappearing if registration fails.  The local list requires a list node, so add a list node member to struct i3c_device.",
  "published": "2026-09-17T17:18:16Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "epss": 0.00161,
  "epssPercentile": 0.05323,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-93202",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-93202",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-93202",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-93202",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-93202",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}