GHSA-X49W-VX84-7X88

Vulnerability from github – Published: 2025-12-07 00:30 – Updated: 2025-12-07 00:30
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd

In snd_usb_create_streams(), for UAC version 3 devices, the Interface Association Descriptor (IAD) is retrieved via usb_ifnum_to_if(). If this call fails, a fallback routine attempts to obtain the IAD from the next interface and sets a BADD profile. However, snd_usb_mixer_controls_badd() assumes that the IAD retrieved from usb_ifnum_to_if() is always valid, without performing a NULL check. This can lead to a NULL pointer dereference when usb_ifnum_to_if() fails to find the interface descriptor.

This patch adds a NULL pointer check after calling usb_ifnum_to_if() in snd_usb_mixer_controls_badd() to prevent the dereference.

This issue was discovered by syzkaller, which triggered the bug by sending a crafted USB device descriptor.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-40275"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-06T22:15:55Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd\n\nIn snd_usb_create_streams(), for UAC version 3 devices, the Interface\nAssociation Descriptor (IAD) is retrieved via usb_ifnum_to_if(). If this\ncall fails, a fallback routine attempts to obtain the IAD from the next\ninterface and sets a BADD profile. However, snd_usb_mixer_controls_badd()\nassumes that the IAD retrieved from usb_ifnum_to_if() is always valid,\nwithout performing a NULL check. This can lead to a NULL pointer\ndereference when usb_ifnum_to_if() fails to find the interface descriptor.\n\nThis patch adds a NULL pointer check after calling usb_ifnum_to_if() in\nsnd_usb_mixer_controls_badd() to prevent the dereference.\n\nThis issue was discovered by syzkaller, which triggered the bug by sending\na crafted USB device descriptor.",
  "id": "GHSA-x49w-vx84-7x88",
  "modified": "2025-12-07T00:30:56Z",
  "published": "2025-12-07T00:30:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40275"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2762d3ea9c929ca4094541ca517c317ffa94625b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/57f607c112966c21240c424b33e2cb71e121dcf0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/632108ec072ad64c8c83db6e16a7efee29ebfb74"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/85568535893600024d7d8794f4f8b6428b521e0c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9f282104627be5fbded3102ff9004f753c55a063"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cbdbfc756f2990942138ed0138da9303b4dbf9ff"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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