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.
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Meta Information
Published
2026-05-28
Last Modified
2026-06-10
Generated
2026-06-17
AI Q&A
2026-05-28
EPSS Evaluated
2026-06-16
NVD
CVE-2026-46146
EUVD
EUVD-2026-32773
Affected Vendors & Products
Showing 18 associated CPEs
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)
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Exploitability
CWE
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KEV
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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.
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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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