CVE-2025-40275 (GCVE-0-2025-40275)

Vulnerability from cvelistv5 – Published: 2025-12-06 21:50 – Updated: 2026-05-11 21:46
VLAI
Title
ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 17156f23e93c0f59e06dd2aaffd06221341caaee , < 23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4 (git)
Affected: 17156f23e93c0f59e06dd2aaffd06221341caaee , < c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6 (git)
Affected: 17156f23e93c0f59e06dd2aaffd06221341caaee , < 9f282104627be5fbded3102ff9004f753c55a063 (git)
Affected: 17156f23e93c0f59e06dd2aaffd06221341caaee , < 2762d3ea9c929ca4094541ca517c317ffa94625b (git)
Affected: 17156f23e93c0f59e06dd2aaffd06221341caaee , < 57f607c112966c21240c424b33e2cb71e121dcf0 (git)
Affected: 17156f23e93c0f59e06dd2aaffd06221341caaee , < cbdbfc756f2990942138ed0138da9303b4dbf9ff (git)
Affected: 17156f23e93c0f59e06dd2aaffd06221341caaee , < 85568535893600024d7d8794f4f8b6428b521e0c (git)
Affected: 17156f23e93c0f59e06dd2aaffd06221341caaee , < 632108ec072ad64c8c83db6e16a7efee29ebfb74 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.18
Unaffected: 0 , < 4.18 (semver)
Unaffected: 5.4.302 , ≤ 5.4.* (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.59 , ≤ 6.12.* (semver)
Unaffected: 6.17.9 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "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."
        }
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      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6"
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    "cveId": "CVE-2025-40275",
    "datePublished": "2025-12-06T21:50:57.914Z",
    "dateReserved": "2025-04-16T07:20:57.184Z",
    "dateUpdated": "2026-05-11T21:46:11.980Z",
    "state": "PUBLISHED"
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            "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",
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            "url": "https://git.kernel.org/stable/c/cbdbfc756f2990942138ed0138da9303b4dbf9ff"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:19:36+00:00",
      "cve": "CVE-2025-40275",
      "id": "CVE-2025-40275",
      "initial_release_date": "2025-12-06T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40275.json",
      "version": "3"
    }
  }
}



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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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