Vulnerability in mm/mempolicy package: mpol_new leak in shared_policy_replace
Summary
GSD-2022-1002177: mm/mempolicy: fix mpol_new leak in shared_policy_replace. Affects Kernel versions >= 42288fe366c4f1ce7522bc9f27d0bc2a81c55264, < 25f506273b6ae806fd46bfcb6fdaa5b9ec81a05b. No fix is published. How to fix ↓
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Background
The mm/mempolicy package is a component of the Linux Kernel that handles memory policies for processes. It provides a mechanism for controlling the NUMA (Non-Uniform Memory Access) behavior of processes, allowing them to be bound to specific memory nodes. The shared_policy_replace function in this package is responsible for replacing the shared memory policy of a process. However, a vulnerability has been discovered in this function that can lead to a memory leak.
Vulnerability Detail
The vulnerability in the mm/mempolicy package arises from a memory leak in the shared_policy_replace function. When replacing the shared memory policy of a process, the function fails to release the memory allocated for the new policy, resulting in a memory leak. This can lead to resource exhaustion and potential denial-of-service attacks. The vulnerability was introduced in version v3.8 of the Linux Kernel and has been fixed in version v5.4.189.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability.
Conclusion
In conclusion, the mm/mempolicy package in the Linux Kernel is vulnerable to a memory leak in the shared_policy_replace function. This can lead to resource exhaustion and potential denial-of-service attacks. It is recommended to update the Linux Kernel to version v5.4.189 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The mm/mempolicy package is a component of the Linux Kernel that handles memory policies for processes, allowing control over NUMA behavior.
The shared_policy_replace function is responsible for replacing the shared memory policy of a process in the mm/mempolicy package.
A memory leak occurs when memory is allocated but not properly released, leading to a gradual depletion of available memory resources.
The vulnerability can result in resource exhaustion and potential denial-of-service attacks due to the memory leak.
To fix this vulnerability, update the Linux Kernel to version v5.4.189 or later.
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