{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-38628",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-38628"
  ],
  "published": "2024-06-21T10:24:08Z",
  "summary": "usb: gadget: u_audio: Fix race condition use of controls after free during gadget unbind.",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: u_audio: Fix race condition use of controls after free during gadget unbind.\n\nHang on to the control IDs instead of pointers since those are correctly\nhandled with locks.",
  "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-2024-38628"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/89e66809684485590ea0b32c3178e42cba36ac09"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/453d3fa9266e53f85377b911c19b9a4563fa88c0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bea73b58ab67fe581037ad9cdb93c2557590c068"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1b739388aa3f8dfb63a9fca777e6dfa6912d0464"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The free side of the race is driven by local gadget teardown (`configfs` UDC unbind / `afunc_unbind` \u2192 `g_audio_cleanup`) and by the userspace close of the ALSA control fd that gates the deferred `snd_card_free_when_closed()`, while the use side is reachable locally through `dummy_hcd`/`raw-gadget` acting as an in-software USB host. This matches established kernel.org scoring for USB gadget bind/unbind use-after-frees (e.g. CVE-2025-38555, CVE-2026-63894).\nAC:L - The attacker controls both sides of the race \u2014 the moment of the free (unbind plus closing the last `/dev/snd/control*` descriptor, which is what actually triggers `snd_card_do_free()` and releases the kcontrols) and the moment of the use (UAC volume/mute `SET_CUR` transfers, altsetting changes, or bus suspend) \u2014 so it can be retried and won reliably.\nPR:L - An unprivileged local user can hold and release the ALSA control descriptor to pin the exact instant the kcontrols are freed and can drive the USB-side control transfers via the loopback host stack, consistent with the PR:L assigned to other gadget teardown use-after-frees reached through the same configfs path.\nUI:N - The attacker performs every step itself \u2014 unbind, fd close, and the UAC control traffic \u2014 with no action required from any other user.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stale `snd_kcontrol` is read after free and its `id` field (including the 64-byte name) is copied into a `snd_ctl_event` delivered to userspace readers of the control device, leaking groomable freed slab contents; a controlled use-after-free read of this kind is a general kernel memory disclosure primitive.\nI:H - `set_active()` and `u_audio_set_volume/mute()` acquire `prm->lock` and write `prm->active`/`volume`/`mute` into the already-`kfree()`d `snd_uac_chip`, and `snd_ctl_notify()` performs list insertion on the freed `snd_card`, giving write-after-free and list-corruption primitives that can be leveraged for control-flow hijacking.\nA:H - Use of freed kcontrol, `snd_card`, and `snd_uac_chip` objects \u2014 including spinlock operations and list walks on freed memory \u2014 reliably produces KASAN splats, list corruption, and kernel panics."
    }
  }
}