Critical Vulnerability in Linux Kernel: s390/stacktrace Return Statement Issue
Summary
DEBIAN-CVE-2024-56550: In the Linux kernel, the following vulnerability has been resolved: s390/stacktrace: Use break instead of return statement arch_stack_walk_user_common() contains a return statement instead of a break statement in case st... Affects linux versions < 6.12.5-1. Fixed in 6.12.5-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, managing hardware and system resources. It provides essential services for all other parts of the operating system. The kernel is known for its robustness and performance, but like any complex software, it is susceptible to vulnerabilities. This specific vulnerability affects the s390 architecture, where a coding error in the stack trace handling can lead to severe consequences for user space processes.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the arch_stack_walk_user_common() function, where a return statement is incorrectly used instead of a break statement when store_ip() fails. This misstep can prevent the pagefault_enable() call from executing, which is crucial for handling page faults. As a result, if a page fault occurs in the affected process, it will not be resolved correctly, potentially leading to the termination of the process. This vulnerability is particularly concerning as it can disrupt normal operations and affect system stability.
How To Fix
Minimum fixed version
6.12.5-1
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 is available.
Conclusion
The vulnerability identified in the Linux kernel poses a significant risk to system stability and user processes. It is imperative for users to update to the patched version to ensure their systems remain secure. Monitoring tools like Vulert can assist in identifying vulnerabilities in your software, providing an additional layer of security.
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FAQ
The vulnerability involves a coding error in the Linux kernel that can lead to improper handling of page faults, potentially causing processes to be killed.
The vulnerability affects Debian versions 13 and 14 of the Linux kernel prior to version 6.12.5-1.
You can check your kernel version by running 'uname -r' in the terminal. If it is below 6.12.5-1, your system is vulnerable.
Yes, you can use Vulert, which monitors and alerts for open-source vulnerabilities in your software using a manifest file like package-lock.json. You can check your application against known vulnerabilities using the Vulert playground.
While there are no specific workarounds, it is crucial to prioritize updating your kernel to mitigate the risk associated with this vulnerability.
References
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