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CVE-2021-46953

6.7 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ACPI: GTDT: Don't corrupt interrupt mappings on watchdow probe failure When failing the driver probe because of invalid firmwar…

Published Feb 27, 2024EPSS 0.24%

Overview

CVE-2021-46953 is a medium-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 6.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.7, 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:

ACPI: GTDT: Don't corrupt interrupt mappings on watchdow probe failure

When failing the driver probe because of invalid firmware properties,

the GTDT driver unmaps the interrupt that it mapped earlier.

However, it never checks whether the mapping of the interrupt actially

succeeded. Even more, should the firmware report an illegal interrupt

number that overlaps with the GIC SGI range, this can result in an

IPI being unmapped, and subsequent fireworks (as reported by Dann

Frazier).

Rework the driver to have a slightly saner behaviour and actually

check whether the interrupt has been mapped before unmapping things.

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/1ecd5b129252249b9bc03d7645a7bda512747277Refgit.kernel.org/stable/c/42e69521ee1fa5abf21f478d147d06bbfe6bf6a8Refgit.kernel.org/stable/c/504632a3577a049dd9bb7aabae5b4476f9c586b4Refgit.kernel.org/stable/c/596e079c362ac17ed02aa1b99fdc444d62072a01Refgit.kernel.org/stable/c/7b2162db1498c71962a4bb2f776fa4e76d4d305bRefgit.kernel.org/stable/c/c3385a9122f8db15b453e07bfc88117fce7f3724Refgit.kernel.org/stable/c/e0f2d86481eaa83df33b0793f75212919db7a19dRefgit.kernel.org/stable/c/1ecd5b129252249b9bc03d7645a7bda512747277Refgit.kernel.org/stable/c/42e69521ee1fa5abf21f478d147d06bbfe6bf6a8Refgit.kernel.org/stable/c/504632a3577a049dd9bb7aabae5b4476f9c586b4

How CyberStrike helps

Frequently asked questions

What is CVE-2021-46953?

CVE-2021-46953 is a medium-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 6.7 (MEDIUM).

How severe is CVE-2021-46953?

This vulnerability has a CVSS 3.1 base score of 6.7, 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-2021-46953?

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-2021-46953?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-46953 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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