CVE-2025-40275 - ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd

CVE-2025-40275 - ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd

https://cvefeed.io/rssfeed/latest.atom / Sun, 12/07/2025 - 01:51
CVE ID : CVE-2025-40275
Published : Dec. 6, 2025, 10:15 p.m. | 1 hour, 59 minutes ago
Description : 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: 0.0 | NA
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