What is CVE-2025-40275?

CVE-2025-40275 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 4.18 onward and patched in 5.4.302, 5.10.247, 5.15.197 and others. CVE-2025-40275 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-40275?

CVE-2025-40275 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2025-40275?

Yes, CVE-2025-40275 has been patched. Fixed versions include 5.4.302, 5.10.247, 5.15.197 and others. If you are running Linux kernel 4.18 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-40275 actively exploited?

CVE-2025-40275 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

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.

Package Linux Kernel

Published 2025-12-06

Last modified 2026-04-15

Patch available

Yes

Affected versions

Linux kernel versions 4.18 and later are affected. Fixed in 5.4.302, 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.59, 6.17.9, 6.18 and their respective stable series.

Affected from

≥ 4.18

Fixed in

✓ 5.4.302 5.4.x ✓ 5.10.247 5.10.x ✓ 5.15.197 5.15.x ✓ 6.1.159 6.1.x ✓ 6.6.117 6.6.x ✓ 6.12.59 6.12.x ✓ 6.17.9 6.17.x ✓ 6.18

References

The following references provide additional information about CVE-2025-40275 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4
Patch
Kernel patch commit
https://git.kernel.org/stable/c/2762d3ea9c929ca4094541ca517c317ffa94625b
Patch
Kernel patch commit
https://git.kernel.org/stable/c/57f607c112966c21240c424b33e2cb71e121dcf0
Patch

8 patch commits total View all on NVD

Frequently asked questions

What is CVE-2025-40275?

CVE-2025-40275 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.18 onward and has been patched in 5.4.302, 5.10.247, 5.15.197 and others. CVE-2025-40275 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2025-40275?

Yes — CVE-2025-40275 has been patched. Fixed versions include 5.4.302, 5.10.247, 5.15.197 and others. If you are running Linux kernel 4.18 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-40275 actively exploited?

No — CVE-2025-40275 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.