CVE-2021-47035

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.

• https://git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0Patch
• https://git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20Patch
• https://git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2Patch
• https://git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9cPatch
• https://git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0Patch
• https://git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20Patch
• https://git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2Patch
• https://git.kernel.org/stable/c/c848416cc05afc1589edba04fe00b85c2f797ee3Patch
• https://git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9cPatch

Published

Feb 28, 2024

Last Modified

Aug 4, 2026

Status

Modified

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