{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38656",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38656"
  ],
  "published": "2025-08-22T16:01:13Z",
  "summary": "wifi: iwlwifi: Fix error code in iwl_op_mode_dvm_start()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: Fix error code in iwl_op_mode_dvm_start()\n\nPreserve the error code if iwl_setup_deferred_work() fails.  The current\ncode returns ERR_PTR(0) (which is NULL) on this path.  I believe the\nmissing error code potentially leads to a use after free involving\ndebugfs.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38656"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/991e2066f6009d3cb898413058c62dbcc92bd6d2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1d068272c21d886d06526454b68368100ba0a720"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cf80c02a9fdb6c5bc8508beb6a0f6a1294fc32f6"
    }
  ],
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable code is only reachable through the iwlwifi driver's PCI probe / firmware-load callback and the `iwl_opmode_register()` path when the `iwldvm` module loads \u2014 local module-load or device-bind activity, not any network or wireless frame processing (the radio is not even up at this point).\nAC:L - Reaching the faulty branch requires `alloc_ordered_workqueue()` to fail with ENOMEM at one specific small allocation during a one-shot driver probe; an attacker can raise system-wide memory pressure but cannot influence the timing of a boot-time or hotplug probe, so success depends on conditions outside their control.\nPR:L - Driver probe is normally triggered by root (modprobe, sysfs bind/unbind) or by hotplug, but an unprivileged local user can supply the only other precondition \u2014 memory exhaustion \u2014 while a probe occurs, so basic local user privileges are assumed rather than full root.\nUI:N - No victim action beyond ordinary system operation is needed; the probe path executes automatically at boot, on module autoload, or on device hotplug.\nS:U - The freed objects and the stale debugfs dentry all live in the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The commit identifies a resulting use-after-free involving debugfs; `ieee80211_free_hw()` has already freed the `iwl_priv` allocation while `drv->dbgfs_op_mode` still references the orphaned tree, and a UAF on reclaimed slab memory can be leveraged to read attacker-chosen kernel data.\nI:H - The same use-after-free lets a reclaiming allocation overlap the freed object, giving a write primitive over kernel heap state that can be escalated to control-flow corruption.\nA:H - The driver is left in a half-torn-down state with a dangling debugfs reference, and dereferencing freed memory produces an oops/panic \u2014 a full availability loss, on top of the WiFi device being permanently unusable."
    }
  }
}