Unchecked Memory Allocation Vulnerability in Linux Kernel (CVE-2019-12455)
Summary
DEBIAN-CVE-2019-12455: An issue was discovered in sunxi_divs_clk_setup in drivers/clk/sunxi/clk-sunxi.c in the Linux kernel through 5.1.5. 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 system resources and facilitating communication between hardware and software. It is widely used in various environments, from servers to embedded systems. The vulnerability in question arises from an unchecked memory allocation in the sunxi_divs_clk_setup function, which is part of the clock management subsystem in the kernel. This issue affects multiple Debian versions, making it critical for users to be aware of its implications.
Vulnerability Detail
An issue was discovered in sunxi_divs_clk_setup in drivers/clk/sunxi/clk-sunxi.c in the Linux kernel through version 5.1.5. The vulnerability stems from an unchecked kstrndup of derived_name, which could allow an attacker to trigger a denial of service by causing a NULL pointer dereference, leading to a system crash. However, it is important to note that this ID is disputed as not being a significant issue since the memory allocation that was not checked occurs during boot time, before user processes are initiated, thus preventing unprivileged user exploitation.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
Currently, there are no specific workarounds recommended for this vulnerability, as it primarily affects the boot process and does not allow unprivileged user control.
Conclusion
CVE-2019-12455 represents a potential denial of service vulnerability in the Linux kernel due to unchecked memory allocation. While it is disputed as a significant issue, users are encouraged to update their systems to mitigate any risks. Utilizing tools like Vulert can help in monitoring vulnerabilities effectively.
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FAQ
CVE-2019-12455 is a vulnerability in the Linux kernel that involves unchecked memory allocation, potentially leading to a denial of service.
Debian versions 11, 12, 13, and 14 are affected by this vulnerability.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software without requiring code access or installation.
Yes, users can update their Linux kernel to the latest version to apply the necessary patches.
While there are no specific workarounds, it is advisable to monitor your system closely and plan for an update as soon as possible.
References
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