{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89736",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89736"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "usb: gadget: u_audio: Fix use-after-free on sound card disconnect",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: u_audio: Fix use-after-free on sound card disconnect\n\ng_audio_cleanup() invokes snd_card_free_when_closed() to initiate sound\ncard teardown and immediately frees the underlying struct snd_uac_chip\ncontext. However, snd_card_free_when_closed() returns asynchronously\nwhile ALSA control elements (kctls) remain open in userspace.\n\nWhen userspace control applications access or close these open file\ndescriptors, kctl callbacks attempt to dereference kctl->private_data\npointing to &uac->c_prm or &uac->p_prm within the freed uac structure,\nresulting in a use-after-free (UAF) memory corruption.\n\nFix this issue by deferring the destruction of struct snd_uac_chip until\nall references to the ALSA sound card are released. Register a custom\ncard->private_free callback (u_audio_card_free) during g_audio_setup()\nthat frees uac and its associated playback/capture request and ring\nbuffers only when the sound card reference count drops to zero.",
  "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-2026-89736"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f983793f03148b097977f200298db215cd2d4438"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6f46762196f04464e1050a9ee94e72b917db9010"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/891a8d11f4d5eb50b2ce7570f4f98204a7a57493"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c74ff0b1a0fca53d3ac185873c87d6a719b30a47"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4e747c864a88537e18b1ffc19a1954c9686bb8e1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/79a92896e2bb9471550c56fc23d8d93592f04c27"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/858965947081d10d41d9a1010a540d3d5eea958b"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The UAF is reached from local userspace: configfs UDC unbind calls afunc_unbind/f_audio_unbind \u2192 g_audio_cleanup, which frees snd_uac_chip while ALSA kctl/PCM fds still reference it; g_audio_setup runs at function bind with no USB host required, matching gadget teardown scores such as CVE-2024-38628.\nAC:L - The attacker controls both sides by issuing SNDRV_CTL_IOCTL_ELEM_READ/WRITE on the UAC mixer kctls while concurrently unbinding the gadget; snd_card_disconnect does not drain in-flight ioctls before g_audio_cleanup kfree()s the chip, so kctl get/put callbacks dereference freed uac_rtd_params and the race is freely retryable.\nPR:L - Android and embedded USB gadget HALs commonly delegate /sys/kernel/config/usb_gadget UDC writes to non-root service accounts, and the UAC gadget's ALSA control/PCM nodes are reachable by unprivileged local users; init-namespace root is not required once the gadget is deployed.\nUI:N - The attacker performs gadget unbind, holds ALSA fds, and issues mixer ioctls itself; no separate victim action such as plugging a cable or mounting a filesystem is required.\nS:U - The use-after-free corrupts kernel heap objects (snd_uac_chip and its playback/capture rings) within the same host kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Kctl get/info/tlv callbacks (u_audio_volume_get, u_audio_rate_get, u_audio_volume_tlv) read volume, rate, and TLV fields from the already-freed snd_uac_chip and copy them to userspace, yielding a use-after-free disclosure primitive that kernel scoring treats as High confidentiality.\nI:H - Kctl put callbacks (u_audio_volume_put, u_audio_mute_put, u_audio_pitch_put) take prm->lock and write volume/mute/pitch into the kfree()'d snd_uac_chip, providing a write-after-free primitive that can be turned into arbitrary write or control-flow hijack.\nA:H - Use of the freed snd_uac_chip, including spin_lock_irqsave on prm->lock and USB ISO completions with req->context pointing into the freed object, reliably produces KASAN reports, oops, and kernel panic."
    }
  }
}