Bug 2436825 (CVE-2026-23078)

Summary: CVE-2026-23078 kernel: ALSA: scarlett2: Fix buffer overflow in config retrieval
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A heap buffer overflow vulnerability was found in the Linux kernel's ALSA scarlett2 driver for Focusrite Scarlett audio interfaces. The scarlett2_usb_get_config() function incorrectly checks the total buffer size instead of element size when performing endianness conversion. When count is greater than 1, the loop accesses count*2 bytes while only size bytes are allocated, causing a buffer overflow.
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Description OSIDB Bzimport 2026-02-04 17:05:14 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ALSA: scarlett2: Fix buffer overflow in config retrieval

The scarlett2_usb_get_config() function has a logic error in the
endianness conversion code that can cause buffer overflows when
count > 1.

The code checks `if (size == 2)` where `size` is the total buffer size in
bytes, then loops `count` times treating each element as u16 (2 bytes).
This causes the loop to access `count * 2` bytes when the buffer only
has `size` bytes allocated.

Fix by checking the element size (config_item->size) instead of the
total buffer size. This ensures the endianness conversion matches the
actual element type.
Comment 1 Jon Moroney 2026-02-04 19:43:50 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026020420-CVE-2026-23078-61cc@gregkh/T