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CVE-2026-43436: ALSA: usb-audio: Check endpoint numbers at parsing Scarlett2 mixer interfaces

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-08 · updated 2026-06-17
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Check endpoint numbers at parsing Scarlett2 mixer interfaces The Scarlett2 mixer quirk in USB-audio driver may hit a NULL dereference when a malformed USB descriptor is passed, since it assumes the presence of an endpoint in the parsed interface in scarlett2_find_fc_interface(), as reported by fuzzer. For avoiding the NULL dereference, just add the sanity check of bNumEndpoints and skip the invalid interface.

Affected products

• Linux kernel: from 5.14 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.19; from 6.19 before 6.19.9; 7.0-rc1, 7.0-rc2, 7.0-rc3 — fixed in 6.1.167, 6.12.78, 6.18.19, 6.19.9, 6.6.130

How to fix

Upgrade to a fixed version: Linux kernel 6.1.167, 6.12.78, 6.18.19, 6.19.9. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3d4f23885e4b90347c9a1d779af6e79a99b5172a
• https://git.kernel.org/stable/c/3d542cf3c4c854cdf5d58049771f68926b9eb2b9
• https://git.kernel.org/stable/c/b014cc945baba75816cda0cf8934be87c9ed4947
• https://git.kernel.org/stable/c/b267255c15d2a5b90c4e926146aa155e5161e264
• https://git.kernel.org/stable/c/c5c5a6c53cf3b658f1d4512dfa61f3cd25bc34ba
• https://git.kernel.org/stable/c/df1d8abf36ca3681c21a6809eaa9a1e01ef897a6

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