CVE-2026-97930
Received Received - Intake

Buffer Overflow in Linux Kernel ALSA usbusx2y Driver

Publication date: 2026-09-25

Last updated on: 2026-09-25

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: usbusx2y: fix in04_last array size mismatch with in04_buf The in04_last array in struct usx2ydev is declared as char[24], but in04_buf is allocated as sizeof(struct us428_ctls) which is 21 bytes. In i_usx2y_in04_int(), when ctl_snapshot_last == -2 (initialization path): memcpy(usx2y->in04_last, usx2y->in04_buf, sizeof(usx2y->in04_last)); This copies 24 bytes from a 21-byte slab allocation, reading 3 bytes past the end of the source object. Introduce a USX2Y_IN04_SIZE constant defined as sizeof(struct us428_ctls) and use it consistently for the in04_last array, the in04_buf allocation, the URB transfer length, and the comparison loop, replacing the bare 24 and 21 literals throughout.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-09-25
Last Modified
2026-09-25
Generated
2026-09-25
AI Q&A
2026-09-25
EPSS Evaluated
N/A
NVD
CVE-2026-97930
EUVD
EUVD-2026-86784

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is a buffer overflow vulnerability in the Linux kernel's ALSA (Advanced Linux Sound Architecture) subsystem. It occurs in the usbusx2y driver where an array size mismatch causes a memcpy operation to read past the allocated buffer. Specifically, the in04_last array is declared as 24 bytes but the in04_buf is only 21 bytes, leading to a 3-byte out-of-bounds read during initialization.

Detection Guidance

This vulnerability is specific to the Linux kernel's ALSA subsystem and relates to a buffer overflow in the usbusx2y driver. Detection requires checking the kernel version and examining the usx2ydev structure in the source code. No network detection commands are applicable.

Impact Analysis

This vulnerability could allow local attackers to cause memory corruption or system crashes by exploiting the buffer overflow. It may lead to denial-of-service conditions or potentially enable privilege escalation if combined with other exploits. Systems using audio devices with the affected usbusx2y driver are at risk.

Mitigation Strategies

Apply the kernel patch that fixes the in04_last array size mismatch. Update to a kernel version that includes the fix for CVE-2026-97930. If patching is not immediately possible, disable the usbusx2y module to prevent exploitation.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-97930. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart