Use-After-Free Vulnerability in Linux Kernel's Greybus Interface
Summary
DEBIAN-CVE-2024-39495: In the Linux kernel, the following vulnerability has been resolved: greybus: Fix use-after-free bug in gb_interface_release due to race condition. Affects linux versions < 5.10.221-1. Fixed in 5.10.221-1. 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 supports a wide range of functionalities, including process management, memory management, and device control. The Greybus interface is a communication protocol used in devices that require high-speed data transfer. This vulnerability affects various versions of the Linux package across multiple Debian releases, making it critical for users to address it promptly.
Vulnerability Detail
In the Linux kernel, a use-after-free vulnerability has been identified in the Greybus interface due to a race condition. The issue arises when the gb_interface_release function is called to clean up resources. If this occurs while a work item (gb_interface_mode_switch_work) is still pending, the object 'intf' may be freed prematurely. Consequently, if the work item attempts to access 'intf' after it has been freed, it can lead to undefined behavior, crashes, or potential exploitation by malicious actors.
How To Fix
Minimum fixed version
5.10.221-1
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
As a temporary workaround, users can avoid invoking gb_interface_release while gb_interface_mode_switch_work is still pending. However, this is not a permanent solution and updating the package is strongly recommended.
Conclusion
The identified use-after-free vulnerability in the Linux kernel's Greybus interface poses significant risks to system stability and security. It is crucial for users to update their packages to the patched versions provided for their respective Debian releases. Utilizing tools like Vulert can aid in monitoring and managing vulnerabilities effectively.
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FAQ
A use-after-free vulnerability occurs when a program continues to use a memory reference after it has been freed, potentially leading to crashes or exploitation.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. Visit Vulert Scanner to check your application without any signup.
Failing to fix this vulnerability could lead to system crashes, data corruption, or exploitation by attackers, compromising system integrity and security.
Yes, this vulnerability affects multiple Debian versions, including Debian 11, 12, 13, and 14, each requiring specific patched versions.
If immediate updates are not possible, consider implementing the suggested workaround and monitor for any unusual behavior in your system.
References
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