8.8

CVE-2021-47035: iommu/vt-d: Remove WO permissions on second-level paging entries

Modified
AliasesUBUNTU-CVE-2021-47035DEBIAN-CVE-2021-47035
Published 28-02-2024Last modified 05-08-2026

Vulnerability summary

CVE-2021-47035 is a high (CVSS 8.8) vulnerability in linux. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 17.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.26%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
SUSE-SU-2024:1465-1SUSE-SU-2024:1489-1

Timeline

  1. 28-02-2024
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

18%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.26% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu62 products
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
  • linux-aws-5.13All versions (No fix recorded)
  • linux-aws-5.19All versions (No fix recorded)
Linux2 products
  • linux≥ b802d070a52a1565b47daaa808872cfbd4a17b01, < 89bd620798704a8805fc9db0d71d7f812cf5b3d2 | ≥ b802d070a52a1565b47daaa808872cfbd4a17b01, < 25faff78138933244c678c7fc78f7c0340fa04a0 | ≥ b802d070a52a1565b47daaa808872cfbd4a17b01, < 66c24699f266ff310381a9552d3576eea8ad6e20 | ≥ b802d070a52a1565b47daaa808872cfbd4a17b01, < eea53c5816889ee8b64544fa2e9311a81184ff9c | 5.6
  • linux_kernel≥ 5.6, < 5.10.37 | ≥ 5.11, < 5.11.21 | ≥ 5.12, < 5.12.4
Debian1 product
  • linux< 5.10.38-1

3 vendors · 65 products

References

9 links