mcb: Fix error handling in mcb_alloc_bus()

Kernel Updated 02 Oct 2025

Summary

19/10/2021

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2021-1001545: mcb: fix error handling in mcb_alloc_bus(). Affects Kernel versions >= 5d9e2ab9fea4cdf0a2522f5cbed2e7fbb220d757, < 115b07d9f47e3996430b8f2007edd9768e1f807f. No fix is published. How to fix ↓

Free scan

Check if this vulnerability affects your application

Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.

Check my app free

No signup required · Results in about 60 seconds

Upload your dependency manifest or SBOM

Drag & drop your file here or Browse

Java Javascript PHP Python Go Rust Ruby Dart C/C++ Elixir CycloneDX SPDX

Upload a supported dependency manifest or SBOM. No installation or source-code access required.

See supported files and SBOM formats

SBOM sbom.json · bom.json · bom.xml · *.spdx.json · *.cdx.json · *.cdx.xml

Java pom.xml · gradle.lockfile · buildscript-gradle.lockfile

Javascript package-lock.json · yarn.lock · pnpm-lock.yaml

PHP composer.lock

Python poetry.lock · requirements.txt · Pipfile.lock

Go go.mod

Rust Cargo.lock

Ruby Gemfile.lock

Dart pubspec.lock

C/C++ conan.lock

Elixir mix.lock

Enter your work email to receive your report link.

Verify your email to view the full report and start 30 days of continuous monitoring. No credit card required.

Background

The mcb package is a part of the Linux Kernel ecosystem. It provides support for the Multichannel Buffered Serial Port (MCBSP) bus controller. The MCBSP is a communication interface commonly used in embedded systems. The mcb_alloc_bus() function is responsible for allocating resources for the MCBSP bus. However, there is a vulnerability in the error handling of this function.

Vulnerability Detail

The vulnerability in mcb_alloc_bus() was introduced in version v4.7 of the Linux Kernel by commit 5d9e2ab9fea4cdf0a2522f5cbed2e7fbb220d757. It was fixed in version v4.14.249 by commit 115b07d9f47e3996430b8f2007edd9768e1f807f. The vulnerability allows an attacker to exploit error conditions in the function, potentially leading to a denial-of-service (DoS) or other security issues. The impact and attack plausibility of this vulnerability have not been proven.

How To Fix

No fixed version is published for this vulnerability.

Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →

Workaround

There is no specific workaround mentioned for this vulnerability.

Conclusion

The mcb package in the Linux Kernel has a vulnerability in the mcb_alloc_bus() function. It is recommended to update the Linux Kernel to version v4.14.249 or later to fix this vulnerability. For more information and support on vulnerability remediation, please contact DevNack.com.

See every vulnerability recorded for Kernel →