FKIE_CVE-2025-40275

Vulnerability from fkie_nvd - Published: 2025-12-06 22:15 - Updated: 2026-10-15 19:10
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2762d3ea9c929ca4094541ca517c317ffa94625b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/57f607c112966c21240c424b33e2cb71e121dcf0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/632108ec072ad64c8c83db6e16a7efee29ebfb74
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/85568535893600024d7d8794f4f8b6428b521e0c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9f282104627be5fbded3102ff9004f753c55a063
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cbdbfc756f2990942138ed0138da9303b4dbf9ff
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/mixer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4",
              "status": "affected",
              "version": "17156f23e93c0f59e06dd2aaffd06221341caaee",
              "versionType": "git"
            },
            {
              "lessThan": "c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6",
              "status": "affected",
              "version": "17156f23e93c0f59e06dd2aaffd06221341caaee",
              "versionType": "git"
            },
            {
              "lessThan": "9f282104627be5fbded3102ff9004f753c55a063",
              "status": "affected",
              "version": "17156f23e93c0f59e06dd2aaffd06221341caaee",
              "versionType": "git"
            },
            {
              "lessThan": "2762d3ea9c929ca4094541ca517c317ffa94625b",
              "status": "affected",
              "version": "17156f23e93c0f59e06dd2aaffd06221341caaee",
              "versionType": "git"
            },
            {
              "lessThan": "57f607c112966c21240c424b33e2cb71e121dcf0",
              "status": "affected",
              "version": "17156f23e93c0f59e06dd2aaffd06221341caaee",
              "versionType": "git"
            },
            {
              "lessThan": "cbdbfc756f2990942138ed0138da9303b4dbf9ff",
              "status": "affected",
              "version": "17156f23e93c0f59e06dd2aaffd06221341caaee",
              "versionType": "git"
            },
            {
              "lessThan": "85568535893600024d7d8794f4f8b6428b521e0c",
              "status": "affected",
              "version": "17156f23e93c0f59e06dd2aaffd06221341caaee",
              "versionType": "git"
            },
            {
              "lessThan": "632108ec072ad64c8c83db6e16a7efee29ebfb74",
              "status": "affected",
              "version": "17156f23e93c0f59e06dd2aaffd06221341caaee",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/mixer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.18"
            },
            {
              "lessThan": "4.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.302",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.247",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.197",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.159",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.117",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.59",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nALSA: usb-audio: Correcci\u00f3n de desreferencia de puntero NULL en snd_usb_mixer_controls_badd\n\nEn snd_usb_create_streams(), para dispositivos UAC versi\u00f3n 3, el Descriptor de Asociaci\u00f3n de Interfaz (IAD) se recupera a trav\u00e9s de usb_ifnum_to_if(). Si esta llamada falla, una rutina de respaldo intenta obtener el IAD de la siguiente interfaz y establece un perfil BADD. Sin embargo, snd_usb_mixer_controls_badd() asume que el IAD recuperado de usb_ifnum_to_if() es siempre v\u00e1lido, sin realizar una comprobaci\u00f3n de NULL. Esto puede llevar a una desreferencia de puntero NULL cuando usb_ifnum_to_if() no logra encontrar el descriptor de interfaz.\n\nEste parche a\u00f1ade una comprobaci\u00f3n de puntero NULL despu\u00e9s de llamar a usb_ifnum_to_if() en snd_usb_mixer_controls_badd() para evitar la desreferencia.\n\nEste problema fue descubierto por syzkaller, que activ\u00f3 el error enviando un descriptor de dispositivo USB manipulado."
    }
  ],
  "id": "CVE-2025-40275",
  "lastModified": "2026-10-15T19:10:00.173",
  "metrics": {},
  "published": "2025-12-06T22:15:55.300",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2762d3ea9c929ca4094541ca517c317ffa94625b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/57f607c112966c21240c424b33e2cb71e121dcf0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/632108ec072ad64c8c83db6e16a7efee29ebfb74"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/85568535893600024d7d8794f4f8b6428b521e0c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9f282104627be5fbded3102ff9004f753c55a063"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cbdbfc756f2990942138ed0138da9303b4dbf9ff"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}



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