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CVE-2021-47018

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: powerpc/64: Fix the definition of the fixmap area At the time being, the fixmap area is defined at the top of the address space…

Published Feb 28, 2024EPSS 0.24%

Overview

CVE-2021-47018 is a medium-severity vulnerability. It was published on February 28, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

powerpc/64: Fix the definition of the fixmap area

At the time being, the fixmap area is defined at the top of

the address space or just below KASAN.

This definition is not valid for PPC64.

For PPC64, use the top of the I/O space.

Because of circular dependencies, it is not possible to include

asm/fixmap.h in asm/book3s/64/pgtable.h , so define a fixed size

AREA at the top of the I/O space for fixmap and ensure during

build that the size is big enough.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/4b9fb2c9039a206d37f215936a4d5bee7b1bf9cdRefgit.kernel.org/stable/c/9ccba66d4d2aff9a3909aa77d57ea8b7cc166f3cRefgit.kernel.org/stable/c/a84df7c80bdac598d6ac9268ae578da6928883e8Refgit.kernel.org/stable/c/abb07dc5e8b61ab7b1dde20dd73aa01a3aeb183fRefgit.kernel.org/stable/c/4b9fb2c9039a206d37f215936a4d5bee7b1bf9cdRefgit.kernel.org/stable/c/9ccba66d4d2aff9a3909aa77d57ea8b7cc166f3cRefgit.kernel.org/stable/c/a84df7c80bdac598d6ac9268ae578da6928883e8Refgit.kernel.org/stable/c/abb07dc5e8b61ab7b1dde20dd73aa01a3aeb183f

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47018?

CVE-2021-47018 is a medium-severity vulnerability. It was published on February 28, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47018?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47018?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47018?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47018 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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