Refcount Leak Bug in cpufreq: pmac32-cpufreq
Summary
GSD-2022-1004791: cpufreq: pmac32-cpufreq: Fix refcount leak bug. Affects Kernel versions < 4585890ab2dbf455d80e254d3d859d4c1e357920. No fix is published. How to fix ↓
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Background
The cpufreq package is a component of the Linux Kernel that manages the frequency scaling of CPUs. It allows the system to dynamically adjust the CPU frequency based on workload, optimizing power consumption and performance. The pmac32-cpufreq module is specifically designed for PowerPC-based Macintosh systems. This module is responsible for controlling the CPU frequency on these machines. However, a refcount leak bug has been discovered in the pmac32-cpufreq module, which can lead to potential security vulnerabilities.
Vulnerability Detail
The refcount leak bug in cpufreq: pmac32-cpufreq allows an attacker to exploit a reference count leak in the module. This can result in memory corruption or use-after-free vulnerabilities, potentially leading to privilege escalation or denial of service attacks. The bug originates from improper handling of reference counts within the module's code. By manipulating the reference counts, an attacker can trigger memory corruption or use-after-free conditions, allowing them to execute arbitrary code or crash the system. This vulnerability has the potential to impact the security and stability of PowerPC-based Macintosh systems running the affected version of the Linux Kernel.
How To Fix
No fixed version is published for this vulnerability.
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Conclusion
The refcount leak bug in cpufreq: pmac32-cpufreq is a potentially serious vulnerability that can lead to memory corruption, use-after-free vulnerabilities, and other security risks. It is crucial to update the Linux Kernel to the recommended version to mitigate the risk of exploitation. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
Cpufreq is a component of the Linux Kernel that manages the frequency scaling of CPUs. It allows the system to dynamically adjust the CPU frequency based on workload, optimizing power consumption and performance.
Pmac32-cpufreq is a module specifically designed for PowerPC-based Macintosh systems. It controls the CPU frequency on these machines.
A refcount leak bug refers to a situation where the reference count of a resource is not properly managed, leading to memory leaks or other vulnerabilities. In this case, the refcount leak bug in cpufreq: pmac32-cpufreq can result in memory corruption or use-after-free vulnerabilities.
The refcount leak bug in cpufreq: pmac32-cpufreq can potentially allow an attacker to execute arbitrary code, escalate privileges, or cause denial of service attacks. It can impact the security and stability of PowerPC-based Macintosh systems running the affected version of the Linux Kernel.
To fix the refcount leak bug, it is recommended to update the Linux Kernel to version v4.19.253 or later. This fix is implemented in commit 4585890ab2dbf455d80e254d3d859d4c1e357920.
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