# CVE-2021-47035: linux: In the Linux kernel, the following vulnerability has been resolved:  iommu/vt-d: Remove WO permissions on second-leve...

CVE-2021-47035 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47035, released February 28, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47035
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 28, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.38-1 | [DEBIAN-CVE-2021-47035](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47035.md) | Feb 28, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.38-1 | [DEBIAN-CVE-2021-47035](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47035.md) | Feb 28, 2024 |
| Linux | linux Debian 14 | 5.10.38-1 | [DEBIAN-CVE-2021-47035](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47035.md) | Feb 28, 2024 |

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