Critical NULL Pointer Dereference Vulnerability in Linux Kernel Package
Summary
DEBIAN-CVE-2023-53206: In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus_core) Fix NULL pointer dereference Pass i2c_client to _pmbus_is_enabled to drop the assumption that a regulator device is passed in. Affects linux versions < 6.4.11-1. Fixed in 6.4.11-1. How to fix ↓
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Background
The Linux kernel is the core component of the 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. The kernel's stability and security are paramount, as vulnerabilities can lead to severe system failures or unauthorized access.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the hwmon subsystem, specifically within the pmbus_core module. This issue arises from a NULL pointer dereference when the function _pmbus_get_flags is called without a valid i2c_client parameter. The assumption that a regulator device is always passed in is flawed, leading to potential crashes or undefined behavior in the system. This vulnerability can compromise system stability and security, making it critical to address.
How To Fix
Minimum fixed version
6.4.11-1
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 provided for this vulnerability. It is recommended to apply the patch as soon as it becomes available.
Conclusion
The identified NULL pointer dereference vulnerability in the Linux kernel's hwmon subsystem poses significant risks to system stability and security. It is crucial for users to update to the patched version 6.4.11-1 to mitigate these risks effectively.
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FAQ
The vulnerability is a NULL pointer dereference in the hwmon subsystem of the Linux kernel, which can lead to system crashes.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Failure to fix this vulnerability may result in system instability, crashes, or potential security breaches.
Yes, versions prior to 6.4.11-1 are vulnerable to this issue.
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References
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