What’s Vulnerable › Vulnerabilities

CVE-2025-40085: ALSA: usb-audio: Fix NULL pointer deference in try_to_register_card

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-29 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix NULL pointer deference in try_to_register_card In try_to_register_card(), the return value of usb_ifnum_to_if() is passed directly to usb_interface_claimed() without a NULL check, which will lead to a NULL pointer dereference when creating an invalid USB audio device. Fix this by adding a check to ensure the interface pointer is valid before passing it to usb_interface_claimed().

Affected products

• Linux kernel: from 5.15.75 before 5.15.196; from 5.19.17 before 5.20; from 6.0.3 before 6.1; 6.1 — fixed in 5.15.196, 5.20, 6.1, 6.18

How to fix

Upgrade to a fixed version: Linux kernel 5.15.196, 5.20, 6.1, 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/28412b489b088fb88dff488305fd4e56bd47f6e4
• https://git.kernel.org/stable/c/576312eb436326b44b7010f4d9ae2b698df075ea
• https://git.kernel.org/stable/c/736159f7b296d7a95f7208eb4799639b1f8b16a0
• https://git.kernel.org/stable/c/8503ac1a62075a085402e42a386b5c627c821a51
• https://git.kernel.org/stable/c/8d19a7ab28c7b9c207db5c5282afa8cc8595bcdb
• https://git.kernel.org/stable/c/bba7208765d26e5e36b87f21dacc2780b064f41f

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