ALSA: usb-audio: Fix use-after-free in snd_usb_mixer_free()

{
  "id": "ff537c26ca73464d8b21094dd7d89d6d0ae8587b02f490cd86ea6834a0638572",
  "url": "https://osv.dev/vulnerability/CVE-2026-23089",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ALSA: usb-audio: Fix use-after-free in snd_usb_mixer_free()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix use-after-free in snd_usb_mixer_free() When snd_usb_create_mixer() fails, snd_usb_mixer_free() frees mixer->id_elems but the controls already added to the card still reference the freed memory. Later when snd_card_register() runs, the OSS mixer layer calls their callbacks and hits a use-after-free read. Call trace: get_ctl_value+0x63f/0x820 sound/usb/mixer.c:411 get_min_max_with_quirks.isra.0+0x240/0x1f40 sound/usb/mixer.c:1241 mixer_ctl_feature_info+0x26b/0x490 sound/usb/mixer.c:1381 snd_mixer_oss_build_test+0x174/0x3a0 sound/core/oss/mixer_oss.c:887 ... snd_card_register+0x4ed/0x6d0 sound/core/init.c:923 usb_audio_probe+0x5ef/0x2a90 sound/usb/card.c:1025 Fix by calling snd_ctl_remove() for all mixer controls before freeing id_elems. We save the next pointer first because snd_ctl_remove() frees the current element.",
    "evidence": "osv:CVE-2026-23089",
    "products": [
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    "severity": "unknown",
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      "modified": "2026-10-28T02:30:23.493967532Z",
      "provider": "osv",
      "references": [
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        "https://git.kernel.org/stable/c/56fb6efd5d04caf6f14994d51ec85393b9a896c6",
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  "source_id": "core-osv",
  "document_id": 490148,
  "published_at": "2026-02-04T16:08:12.575+00:00"
}