CVE-2021-47035
Intel VT-d IOMMU Write-Only Permission Inconsistency Vuln
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.
INFO
Published Date :
Feb. 28, 2024, 9:15 a.m.
Last Modified :
Jan. 24, 2025, 4:15 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the Linux kernel to a patched version.
- Reboot the system after the update.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47035.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47035 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47035
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47035 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47035 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jan. 24, 2025
Action Type Old Value New Value Removed Reference https://git.kernel.org/stable/c/c848416cc05afc1589edba04fe00b85c2f797ee3 Removed Reference Type https://git.kernel.org/stable/c/c848416cc05afc1589edba04fe00b85c2f797ee3 Types: Patch -
Initial Analysis by [email protected]
Jan. 09, 2025
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NIST NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.6 up to (excluding) 5.10.37 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.11.21 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.12 up to (excluding) 5.12.4 Changed Reference Type https://git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0 No Types Assigned https://git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0 Patch Changed Reference Type https://git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0 No Types Assigned https://git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0 Patch Changed Reference Type https://git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20 No Types Assigned https://git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20 Patch Changed Reference Type https://git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20 No Types Assigned https://git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20 Patch Changed Reference Type https://git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2 No Types Assigned https://git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2 Patch Changed Reference Type https://git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2 No Types Assigned https://git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2 Patch Changed Reference Type https://git.kernel.org/stable/c/c848416cc05afc1589edba04fe00b85c2f797ee3 No Types Assigned https://git.kernel.org/stable/c/c848416cc05afc1589edba04fe00b85c2f797ee3 Patch Changed Reference Type https://git.kernel.org/stable/c/c848416cc05afc1589edba04fe00b85c2f797ee3 No Types Assigned https://git.kernel.org/stable/c/c848416cc05afc1589edba04fe00b85c2f797ee3 Patch Changed Reference Type https://git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c No Types Assigned https://git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c Patch Changed Reference Type https://git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c No Types Assigned https://git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0 Added Reference https://git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20 Added Reference https://git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2 Added Reference https://git.kernel.org/stable/c/c848416cc05afc1589edba04fe00b85c2f797ee3 Added Reference https://git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 14, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Feb. 28, 2024
Action Type Old Value New Value Added 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. Added Reference Linux https://git.kernel.org/stable/c/c848416cc05afc1589edba04fe00b85c2f797ee3 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c [No types assigned]