{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-90032",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-90032"
  ],
  "published": "2026-09-16T10:32:03Z",
  "summary": "media: usbtv: keep device alive while ALSA card exists",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: usbtv: keep device alive while ALSA card exists\n\nThe ALSA PCM callbacks store the driver state in pcm->private_data. An\nopen PCM file can outlive USB disconnect because usbtv_audio_free() uses\nsnd_card_free_when_closed(). The disconnect path can then drop the V4L2\ndevice reference and free struct usbtv before ALSA releases the substream,\nso a later close dereferences freed memory in snd_usbtv_pcm_close().\n\nTake a V4L2 device reference for the ALSA card and drop it from the card\nprivate_free callback. This keeps struct usbtv valid until ALSA has closed\nthe remaining files and freed the card.",
  "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-2026-90032"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/97b5e8b22b98e287481a97a9a4cfebbb348738a5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/503be26ff888cb3576e55d251895d290e8146f27"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/be0f7745f883386e5263b4e475686a81dfa87175"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/67374e3a00814dcdd46e9feca61f69f7f2d81957"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/239d1683e08b2aee2a15ef35706e1ea9a76681d8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7690a86b193271322cd31ab77349a87aa10858e4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1618257cb0aba4ce342ae8c0228368c24161f5fb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fc530fe168bb2b745a93f553ad21fc25fd9cba3d"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-16T14:40:32Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The UAF is reached locally by opening the usbtv ALSA capture PCM, forcing usbtv_disconnect() via USBDEVFS_DISCONNECT or sysfs unbind on an already-bound USBTV007, then closing the PCM fd; there is no network or packet path. This matches AV:L scoring of analogous USB disconnect UAFs (CVE-2026-80971, CVE-2026-64585); physical unplug is only an extra path.\nAC:L - The attacker fully controls the sequence: open /dev/snd/pcmC*D*c so PCM callbacks pin pcm->private_data, issue USBDEVFS_DISCONNECT so snd_card_free_when_closed() returns without waiting, then close. That close deterministically hits freed struct usbtv in snd_usbtv_pcm_close(); no attacker-uncontrollable race or layout is required.\nPR:L - USBDEVFS_DISCONNECT has no capable() check, only write access to /dev/bus/usb that udev uaccess/plugdev rules grant seat users, and snd_pcm_open() has no capability gate on the capture PCM node (audio group/uaccess). An unprivileged local account suffices; init-namespace root is not required.\nUI:N - The attacker performs open, disconnect, and close on their own fds against an already-attached USBTV007 (capture kiosk, digitizer, or surveillance station). No separate victim action such as plugging a device or clicking is required during exploitation.\nS:U - The slab use-after-free of struct usbtv and the PCM close/trigger callbacks run entirely in the host kernel. This is ordinary local privilege escalation, not a VM, IOMMU, or sandbox boundary escape.\nC:H - snd_usbtv_pcm_close() and snd_usbtv_card_trigger() read fields of the kfree()'d struct usbtv (snd_stream, snd_trigger, snd_bulk_urb). Reclaiming that slab lets the attacker supply pointer-rich state those paths then read, enabling kernel disclosure as with other heap UAFs.\nI:H - Close can atomic_set snd_stream and schedule_work() on the freed usbtv.snd_trigger work_struct, and snd_pcm_drop may call trigger STOP on the same freed object. A reclaimed fake usbtv plus workqueue execution is a control-flow hijack primitive, so integrity impact is High.\nA:H - Use-after-free of struct usbtv in snd_usbtv_pcm_close() (and in usbtv_audio_urb_received if capture was running when USB core kills the URB after disconnect) oopses or panics the kernel. The attacker can repeat disconnect/close to crash on demand, so availability impact is High."
    }
  }
}