CVE-2021-47035
iommu/vt-d: Remove WO permissions on second-level paging entries
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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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0
- https://git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20
- https://git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2
- https://git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c
- https://git.kernel.org/stable/c/c848416cc05afc1589edba04fe00b85c2f797ee3
References (5)
SSVC — Action Prioritization
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
- Attack Vector
- LOCAL
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
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