CVE-2025-40275 (GCVE-0-2025-40275)
Vulnerability from cvelistv5
Published
2025-12-06 21:50
Modified
2025-12-06 21:50
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
Impacted products
Vendor Product Version
Linux Linux Version: 17156f23e93c0f59e06dd2aaffd06221341caaee
Version: 17156f23e93c0f59e06dd2aaffd06221341caaee
Version: 17156f23e93c0f59e06dd2aaffd06221341caaee
Version: 17156f23e93c0f59e06dd2aaffd06221341caaee
Version: 17156f23e93c0f59e06dd2aaffd06221341caaee
Version: 17156f23e93c0f59e06dd2aaffd06221341caaee
Version: 17156f23e93c0f59e06dd2aaffd06221341caaee
Version: 17156f23e93c0f59e06dd2aaffd06221341caaee
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{
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          "product": "Linux",
          "programFiles": [
            "sound/usb/mixer.c"
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      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-06T21:50:57.914Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4"
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          "url": "https://git.kernel.org/stable/c/c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6"
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        {
          "url": "https://git.kernel.org/stable/c/632108ec072ad64c8c83db6e16a7efee29ebfb74"
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      "title": "ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40275",
    "datePublished": "2025-12-06T21:50:57.914Z",
    "dateReserved": "2025-04-16T07:20:57.184Z",
    "dateUpdated": "2025-12-06T21:50:57.914Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40275\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-06T22:15:55.300\",\"lastModified\":\"2025-12-06T22:15:55.300\",\"vulnStatus\":\"Received\",\"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.\"}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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