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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
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)
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Show details on NVD website
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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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    "dateReserved": "2025-04-16T07:20:57.184Z",
    "dateUpdated": "2026-05-11T21:46:11.980Z",
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        "id": "CVE-2025-40275",
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        "metrics": {},
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      "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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