7.8

CVE-2021-46967: vhost-vdpa: fix vm_flags for virtqueue doorbell mapping

Modified
AliasesUBUNTU-CVE-2021-46967DEBIAN-CVE-2021-46967
Published 27-02-2024Last modified 05-08-2026

Vulnerability summary

CVE-2021-46967 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 14.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.23%
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

Timeline

  1. 27-02-2024
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: vhost-vdpa: fix vm_flags for virtqueue doorbell mapping The virtqueue doorbell is usually implemented via registeres but we don't provide the necessary vma->flags like VM_PFNMAP. This may cause several issues e.g when userspace tries to map the doorbell via vhost IOTLB, kernel may panic due to the page is not backed by page structure. This patch fixes this by setting the necessary vm_flags. With this patch, try to map doorbell via IOTLB will fail with bad address.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.23% 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≥ ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9, < 3b8b6399666a29daa30b0bb3f5c9e3fc81c5a6a6 | ≥ ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9, < 940230a5c31e2714722aee04c521a21f484b4df7 | ≥ ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9, < 93dbbf20e3ffad14f04227a0b7105f6e6f0387ce | ≥ ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9, < 3a3e0fad16d40a2aa68ddf7eea4acdf48b22dd44 | 5.8
  • linux_kernel≥ 5.8, < 5.10.36 | ≥ 5.11, < 5.11.20 | ≥ 5.12, < 5.12.3
Debian1 product
  • linux< 5.10.38-1

3 vendors · 65 products

References

8 links