CVE-2021-47035

published 2024-02-28

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…

Priority P4 21 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

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

13 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.10.38-1 (bookworm)	linux 5.10.38-1 (bookworm)
linux	linux	—	—
linux	linux	>= b802d070a52a1565b47daaa808872cfbd4a17b01 < 89bd620798704a8805fc9db0d71d7f812cf5b3d2	89bd620798704a8805fc9db0d71d7f812cf5b3d2
linux	linux	>= b802d070a52a1565b47daaa808872cfbd4a17b01 < 25faff78138933244c678c7fc78f7c0340fa04a0	25faff78138933244c678c7fc78f7c0340fa04a0
linux	linux	>= b802d070a52a1565b47daaa808872cfbd4a17b01 < 66c24699f266ff310381a9552d3576eea8ad6e20	66c24699f266ff310381a9552d3576eea8ad6e20
linux	linux	>= b802d070a52a1565b47daaa808872cfbd4a17b01 < eea53c5816889ee8b64544fa2e9311a81184ff9c	eea53c5816889ee8b64544fa2e9311a81184ff9c
linux	linux_kernel	>= 0 < 5.10.38-1	5.10.38-1
linux	linux_kernel	>= 0 < 5.10.38-1	5.10.38-1
linux	linux_kernel	>= 0 < 5.10.38-1	5.10.38-1
linux	linux_kernel	>= 0 < 5.10.38-1	5.10.38-1
linux	linux_kernel	>= 5.11 < 5.11.21	5.11.21
linux	linux_kernel	>= 5.12 < 5.12.4	5.12.4
linux	linux_kernel	>= 5.6 < 5.10.37	5.10.37

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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CWE-20