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CVE-2021-47035

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Remove WO permissions on second-level paging entries When the first level page table is used for IOVA translation,…

Published Feb 28, 2024EPSS 0.26%

Overview

CVE-2021-47035 is a high-severity vulnerability. It was published on February 28, 2024 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. 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:

iommu/vt-d: Remove WO permissions on second-level paging entries

When the first level page table is used for IOVA translation, it only

supports Read-Only and Read-Write permissions. The Write-Only permission

is not supported as the PRESENT bit (implying Read permission) should

always set. When using second level, we still give separate permissions

that allows WriteOnly which seems inconsistent and awkward. We want to

have consistent behavior. After moving to 1st level, we don't want things

to work sometimes, and break if we use 2nd level for the same mappings.

Hence remove this configuration.

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/25faff78138933244c678c7fc78f7c0340fa04a0Refgit.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20Refgit.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2Refgit.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9cRefgit.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0Refgit.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20Refgit.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2Refgit.kernel.org/stable/c/c848416cc05afc1589edba04fe00b85c2f797ee3Refgit.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47035?

CVE-2021-47035 is a high-severity vulnerability. It was published on February 28, 2024 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2021-47035?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47035?

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-2021-47035?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47035 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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