CVE-2025-40275

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.

The following products are affected by CVE-2025-40275 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-40275.

URL	Resource
https://git.kernel.org/stable/c/23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4
https://git.kernel.org/stable/c/2762d3ea9c929ca4094541ca517c317ffa94625b
https://git.kernel.org/stable/c/57f607c112966c21240c424b33e2cb71e121dcf0
https://git.kernel.org/stable/c/632108ec072ad64c8c83db6e16a7efee29ebfb74
https://git.kernel.org/stable/c/85568535893600024d7d8794f4f8b6428b521e0c
https://git.kernel.org/stable/c/9f282104627be5fbded3102ff9004f753c55a063
https://git.kernel.org/stable/c/c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6
https://git.kernel.org/stable/c/cbdbfc756f2990942138ed0138da9303b4dbf9ff
https://lore.kernel.org/linux-cve-announce/2025120717-CVE-2025-40275-021a@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2025-40275
https://www.cve.org/CVERecord?id=CVE-2025-40275