Vulnerability in Kernel package: powerpc/64s pte update for kernel memory on radix
Summary
UVI-2021-1000425: powerpc/64s: Fix pte update for kernel memory on radix. Affects Kernel versions >= f1cb8f9beba8699dd1b4518418191499e53f7b17, < 73f9dccb29e4f82574bec2765c0090cdb0404301. No fix is published. How to fix ↓
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Background
The Kernel package is a crucial component of the Linux operating system, responsible for managing system resources and providing an interface between hardware and software. It includes various subsystems and functionalities to ensure the proper functioning of the operating system. One of these subsystems is powerpc/64s, which is specific to the powerpc architecture. This vulnerability affects the pte (page table entry) update for kernel memory on radix. The radix is a data structure used by the powerpc/64s subsystem to manage memory mappings. The vulnerability allows an attacker to manipulate the pte entries for kernel memory, potentially leading to unauthorized access or privilege escalation.
Vulnerability Detail
The vulnerability arises from a flaw in the pte update mechanism for kernel memory on radix in the powerpc/64s subsystem. It was introduced in version v4.18 of the Linux Kernel by commit f1cb8f9beba8699dd1b4518418191499e53f7b17. The issue was fixed in version v5.4.119 by commit 73f9dccb29e4f82574bec2765c0090cdb0404301. The vulnerability allows an attacker to modify the pte entries for kernel memory, potentially gaining unauthorized access or escalating privileges. The impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability. The recommended approach is to apply the fix by updating the Linux Kernel package.
Conclusion
The vulnerability in the powerpc/64s subsystem of the Kernel package, related to the pte update for kernel memory on radix, can potentially lead to unauthorized access or privilege escalation. It is crucial to update the Linux Kernel package to version v5.4.119 or later to mitigate this vulnerability. For further support on vulnerability remediation, you can reach out to DevNack.com.
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FAQ
The vulnerability allows an attacker to manipulate the pte entries for kernel memory, potentially leading to unauthorized access or privilege escalation.
You can use tools like Vulert (https://vulert.com) to check if your system is affected by this vulnerability. Vulert uses a manifest file like package-lock.json to monitor and alert in real-time for open-source vulnerabilities in the software.
As of now, there is no known exploit for this vulnerability. However, it is important to apply the fix as soon as possible to mitigate any potential risks.
The details regarding remote exploitation of this vulnerability are not provided. However, it is always recommended to keep systems up to date with the latest security patches to minimize the risk of remote exploitation.
The specific prerequisites for exploiting this vulnerability are not mentioned. However, it is assumed that an attacker would require some level of access to the system or the ability to execute malicious code.
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