CVE-2021-47035

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

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.

5.5

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.06%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2	patch
https://git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0	patch
https://git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20	patch
https://git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c	patch
https://git.kernel.org/stable/c/c848416cc05afc1589edba04fe00b85c2f797ee3	patch

Frequently Asked Questions

What is the severity of CVE-2021-47035?: CVE-2021-47035 has been scored as a medium severity vulnerability.
How to fix CVE-2021-47035?: To fix CVE-2021-47035, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-47035 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-47035 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-47035?: CVE-2021-47035 affects Linux Linux, Linux Linux.

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