Memory Leak and Identifier Mismanagement in Linux Kernel - CVE-2022-49436
Summary
CVE-2022-49436: In the Linux kernel, the following vulnerability has been resolved: powerpc/papr_scm: Fix leaking nvdimm_events_map elements Right now 'char *' elements allocated for individual 'stat_id' in 'papr_scm_priv.nvdimm_events_... Affects linux versions < 5.18.5-1. Fixed in 5.18.5-1. How to fix ↓
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Background
The Linux kernel is the core component of a Linux operating system, responsible for managing hardware resources and providing essential services to applications. It is widely used across various platforms, including servers, desktops, and embedded systems. This vulnerability specifically affects the powerpc/papr_scm module, which manages persistent memory in Power Architecture systems. The vulnerability arises from improper memory management and assumptions about string termination, leading to potential memory leaks and undefined behavior.
Vulnerability Detail
CVE-2022-49436 is a vulnerability in the Linux kernel's powerpc/papr_scm module. It involves a memory leak where 'char *' elements allocated for individual 'stat_id' in 'papr_scm_priv.nvdimm_events_map[]' are not properly freed during error handling in various functions. Additionally, the code incorrectly assumes that these identifiers are NULL-terminated strings, while they are fixed 8-byte sized identifiers. This mismanagement can lead to increased memory usage and potential crashes or instability in systems utilizing this module.
How To Fix
Minimum fixed version
5.18.5-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. The best course of action is to apply the patch as soon as it becomes available.
Conclusion
CVE-2022-49436 presents a significant vulnerability in the Linux kernel's powerpc/papr_scm module, primarily due to memory management issues. It is crucial for users to update their systems to the patched version to mitigate potential risks. Utilizing tools like Vulert can help in monitoring and managing vulnerabilities effectively.
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FAQ
CVE-2022-49436 is a vulnerability in the Linux kernel's powerpc/papr_scm module that involves memory leaks and incorrect assumptions about string termination.
This vulnerability can lead to increased memory usage, potential crashes, and instability in systems using the affected module.
Yes, a patch is available in version 5.18.5-1 of the Linux package. It is recommended to update to this version or later.
If you cannot update immediately, monitor your system for unusual behavior and consider isolating it from critical operations until the patch can be applied.
You can use Vulert, which allows you to monitor and alert for open-source vulnerabilities in your software using a manifest file like package-lock.json. You can check your application using the Vulert playground at Vulert Scanner without signing up.
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