Riskcovery

CVE-2021-47035

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

State
Published
Severity
8.8 High
Published
Feb 28, 2024
Updated
Aug 5, 2026
Reserved
Feb 27, 2024

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.18.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • b802d070a52a1565b47daaa808872cfbd4a17b01 to before 89bd620798704a8805fc9db0d71d7f812cf5b3d2Affected
  • b802d070a52a1565b47daaa808872cfbd4a17b01 to before 25faff78138933244c678c7fc78f7c0340fa04a0Affected
  • b802d070a52a1565b47daaa808872cfbd4a17b01 to before 66c24699f266ff310381a9552d3576eea8ad6e20Affected
  • b802d070a52a1565b47daaa808872cfbd4a17b01 to before eea53c5816889ee8b64544fa2e9311a81184ff9cAffected
LinuxLinux
  • 5.6Affected
  • before 5.6Not affected
  • 5.10.38 through 5.10.*Not affected
  • 5.11.21 through 5.11.*Not affected
  • 5.12.4 through 5.12.*Not affected
  • 5.13 and laterNot affected

References

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