Critical Null Pointer Dereference Vulnerability in Linux Kernel (Debian:13 and Debian:14)
Summary
DEBIAN-CVE-2024-50223: In the Linux kernel, the following vulnerability has been resolved: sched/numa: Fix the potential null pointer dereference in task_numa_work() When running stress-ng-vm-segv test, we found a null pointer dereference erro... Affects linux versions < 6.11.7-1. Fixed in 6.11.7-1. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing system resources and facilitating communication between hardware and software. It is widely used across various distributions, including Debian. The kernel's functionality includes process management, memory management, device drivers, and system calls. This vulnerability specifically affects the task_numa_work() function, which is involved in NUMA (Non-Uniform Memory Access) balancing, potentially leading to system crashes under certain conditions.
Vulnerability Detail
In the Linux kernel, a null pointer dereference vulnerability has been identified in the task_numa_work() function. This issue arises when the stress-ng-vm-segv test is executed, which attempts to trigger a SIGSEGV error by unmapping the entire address space of a child process. If the child process has no virtual memory areas (VMAs) after the munmap system call, the vma_next() function in task_numa_work() can return a null pointer, leading to a crash. The vulnerability can result in system instability and unexpected behavior, making it critical to address.
How To Fix
Minimum fixed version
6.11.7-1
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. It is recommended to apply the patch as soon as it is available to prevent potential system crashes.
Conclusion
The null pointer dereference vulnerability in the Linux kernel poses significant risks to system stability and performance. It is crucial for users of Debian:13 and Debian:14 to update to the patched version 6.11.7-1 to mitigate these risks. Regular monitoring and prompt updates are essential for maintaining system security.
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FAQ
A null pointer dereference vulnerability occurs when a program attempts to access memory at an address that is null, leading to crashes or undefined behavior.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. You can check if your application is affected by this vulnerability using the Vulert playground at Vulert Scanner without any signup.
The consequences include system crashes, instability, and unexpected behavior, particularly when running specific stress tests.
Yes, updating to version 6.11.7-1 or later will resolve this vulnerability in both Debian:13 and Debian:14.
If an immediate update is not possible, monitor your system closely for crashes and consider isolating critical applications until the patch can be applied.
References
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