CVE-2026-46146

Analyzed Analyzed - Analysis Complete

Linux Kernel Endless Loop in USB Audio Driver

Publication date: 2026-05-28

Last updated on: 2026-06-10

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Avoid potential endless loop in convert_chmap_v3() The convert_chmap_v3() has a loop with its increment size of cs_desc->wLength, but we forgot to validate cs_desc->wLength itself, which may lead to potential endless loop by a malformed descriptor. Add a proper size check to abort the loop for plugging the hole.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-05-28

Last Modified

2026-06-10

Generated

2026-07-08

AI Q&A

2026-05-28

EPSS Evaluated

2026-07-06

NVD

CVE-2026-46146

EUVD

EUVD-2026-32773

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	From 5.4.297 (inc) to 5.5 (exc)
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	From 6.15.11 (inc) to 6.16 (exc)
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	From 6.16.2 (inc) to 6.17 (exc)
linux	linux_kernel	7.1
linux	linux_kernel	From 6.19 (inc) to 7.0.7 (exc)
linux	linux_kernel	From 5.10.241 (inc) to 5.10.258 (exc)
linux	linux_kernel	From 5.15.190 (inc) to 5.15.209 (exc)
linux	linux_kernel	From 6.1.149 (inc) to 6.1.175 (exc)
linux	linux_kernel	From 6.12.43 (inc) to 6.12.88 (exc)
linux	linux_kernel	From 6.17.1 (inc) to 6.18.30 (exc)
linux	linux_kernel	From 6.6.103 (inc) to 6.6.140 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-835	The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

Attack-Flow Graph

Executive Summary

This vulnerability exists in the Linux kernel's ALSA usb-audio component, specifically in the function convert_chmap_v3().

The function contains a loop that increments by the size value cs_desc->wLength, but there is no validation of this size value itself.

If a malformed descriptor provides an invalid cs_desc->wLength, it can cause the loop to run endlessly, leading to a potential endless loop condition.

The fix involved adding a proper size check to abort the loop when an invalid size is detected, preventing the endless loop.

Impact Analysis

The vulnerability can cause the affected function in the Linux kernel to enter an endless loop when processing a malformed USB audio descriptor.

This may lead to resource exhaustion such as CPU usage spikes or system instability, potentially affecting system performance or availability.

Mitigation Strategies

To mitigate this vulnerability, update the Linux kernel to a version where the ALSA usb-audio convert_chmap_v3() function includes the proper size check to prevent the potential endless loop caused by malformed descriptors.

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