8.8

CVE-2026-64042: vfio/pci: Check BAR resources before exporting a DMABUF

Analyzed
AliasesUBUNTU-CVE-2026-64042DEBIAN-CVE-2026-64042
Published 19-07-2026Last modified 05-08-2026

Vulnerability summary

CVE-2026-64042 is a high (CVSS 8.8) Missing Authorization vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.4% 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
0.14%
0%100%
Low · -0.02 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 9 · Related 8
RHSA-2026:65334USN-8593-1USN-8603-1USN-8618-1USN-8663-1USN-8664-1

Timeline

  1. 19-07-2026
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: vfio/pci: Check BAR resources before exporting a DMABUF A DMABUF exports access to BAR resources and, although they are requested at startup time, we need to ensure they really were reserved before exporting. Otherwise, it's possible to access unreserved resources through the export. Add a check to the DMABUF-creation path.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

Decrease -0.02 pp

From 0.17% 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

Affected systems

Version check

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

Ubuntu111 products
  • linux< 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 7.0.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 5d74781ebc86c5fa9e9d6934024c505412de9b52, < 8443cd4497a4498c4b01058d76a92116244cb605 | ≥ 5d74781ebc86c5fa9e9d6934024c505412de9b52, < 702809dabdecca807bdd50cfdcc1c980feb2ba62 | 6.19
  • linux_kernel≥ 6.19, < 7.0.11 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3
Debian1 product
  • linux< 7.0.12-1

3 vendors · 114 products

References

14 links
Show all 14 references