VYPR
← All advisories
Unrated severityNVD Advisory· Published Dec 6, 2025· Updated Apr 15, 2026

CVE-2025-40275

CVE-2025-40275

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

112

Patches

Vulnerability mechanics

References

8

News mentions

0

No linked articles in our index yet.