Memory Leak Vulnerability in Linux Kernel - CVE-2023-53441
Summary
CVE-2023-53441: In the Linux kernel, the following vulnerability has been resolved: bpf: cpumap: Fix memory leak in cpu_map_update_elem Syzkaller reported a memory leak as follows: BUG: memory leak unreferenced object 0xff110001198ef748... Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. 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 kernel is critical for system stability and performance. The vulnerability CVE-2023-53441 affects various Debian versions of the Linux kernel, leading to potential memory leaks that can degrade system performance.
Vulnerability Detail
CVE-2023-53441 is a memory leak vulnerability in the Linux kernel's BPF (Berkeley Packet Filter) subsystem, specifically within the cpu_map_update_elem function. This issue arises when kthread_stop is called before executing the thread function of a kernel thread, preventing proper memory deallocation. As a result, allocated resources such as rcpu, rcpu->queue, and rcpu->queue->queue remain unreleased, leading to memory leaks. This can cause increased memory usage over time, potentially leading to system instability or crashes.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. It is recommended to apply the available patches as soon as possible to mitigate the risk.
Conclusion
CVE-2023-53441 is a critical memory leak vulnerability in the Linux kernel that affects multiple Debian versions. It is essential to apply the necessary patches to mitigate risks associated with this vulnerability. Regular monitoring and updates are crucial for maintaining system security.
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FAQ
CVE-2023-53441 is a memory leak vulnerability in the Linux kernel's BPF subsystem that can lead to increased memory usage and potential system instability.
Debian 11, 12, 13, and 14 are affected by this vulnerability, with specific patched versions available for each.
You can use Vulert, which monitors open-source vulnerabilities in your software. By simply using a manifest file like package-lock.json, you can check for vulnerabilities without needing to access the code.
If exploited, this vulnerability can lead to memory leaks, resulting in degraded system performance and potential crashes.
To apply the patch, update your Linux package to the latest version using the command: sudo apt-get update && sudo apt-get upgrade linux.
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