CVE-2026-43436 ALSA: usb-audio: Check endpoint numbers at parsing Scarlett2 mixer interfaces
A malformed USB descriptor can cause a NULL pointer dereference in the Linux kernel's Scarlett2 mixer driver, leading to a system crash.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-43436?
CVE-2026-43436 is a medium-severity vulnerability in Linux kernel, published on 8 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-476
Which versions are affected by CVE-2026-43436?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43436?
Apply the vendor's patch.
Is CVE-2026-43436 being exploited?
There is no known exploitation of CVE-2026-43436 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43436, DEBIAN-CVE-2026-43436, GHSA-g84q-9979-4xf8, ROOT-OS-UBUNTU-2204-CVE-2026-43436, ROOT-OS-UBUNTU-2404-CVE-2026-43436, UBUNTU-CVE-2026-43436.