Use-After-Free Vulnerability in Linux Kernel - linux Package
Summary
DEBIAN-CVE-2023-52629: In the Linux kernel, the following vulnerability has been resolved: sh: push-switch: Reorder cleanup operations to avoid use-after-free bug The original code puts flush_work() before timer_shutdown_sync() in switch_drv_r... Affects linux versions < 6.5.6-1. Fixed in 6.5.6-1. How to fix ↓
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Background
The linux package is a core component of the Debian operating system, providing the Linux kernel that manages system resources and hardware interactions. It is essential for the operation of the system, enabling communication between software and hardware. The kernel is responsible for process management, memory management, device drivers, and system calls. Due to its critical role, vulnerabilities in the kernel can have severe implications for system security and stability.
Vulnerability Detail
In the Linux kernel, a use-after-free vulnerability was identified due to improper ordering of cleanup operations in the switch_drv_remove() function. The original implementation called flush_work() before timer_shutdown_sync(), which could lead to a situation where a worker is rescheduled after its associated data structure has been freed. This flaw could allow an attacker to exploit the vulnerability, potentially leading to arbitrary code execution or system crashes.
How To Fix
Minimum fixed version
6.5.6-1
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 by updating the package as described above.
Conclusion
The identified use-after-free vulnerability in the Linux kernel's linux package poses significant risks to system security and stability. Users are urged to update to the patched version to mitigate these risks. Regular updates and monitoring for vulnerabilities are essential practices for maintaining a secure system.
See every vulnerability recorded for linux →
FAQ
A use-after-free vulnerability occurs when a program continues to use a memory location after it has been freed. This can lead to unpredictable behavior, crashes, or security exploits.
You can use Vulert to monitor and alert for open-source vulnerabilities. By uploading your manifest file like package-lock.json, you can check if your application is affected by this vulnerability.
Exploitation of this vulnerability could lead to arbitrary code execution, system crashes, or unauthorized access to system resources, posing significant security risks.
While the primary risk is related to system stability and security, there is a potential for data loss if an attacker exploits the vulnerability to crash the system or execute malicious code.
It is recommended to regularly check for updates and apply them promptly, especially for critical components like the Linux kernel, to ensure security and stability.
References
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