CVE-2026-64042 (GCVE-0-2026-64042)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-07-20 13:42
VLAI
Title
vfio/pci: Check BAR resources before exporting a DMABUF
Summary
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.
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 5d74781ebc86c5fa9e9d6934024c505412de9b52 , < 8443cd4497a4498c4b01058d76a92116244cb605 (git)
Affected: 5d74781ebc86c5fa9e9d6934024c505412de9b52 , < 702809dabdecca807bdd50cfdcc1c980feb2ba62 (git)
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Linux Linux Affected: 6.19
Unaffected: 0 , < 6.19 (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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    "dateReserved": "2026-07-19T07:54:57.029Z",
    "dateUpdated": "2026-07-20T13:42:43.720Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
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      "current_release_date": "2026-07-20T15:27:35+00:00",
      "cve": "CVE-2026-64042",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: vfio/pci: Check BAR resources before exporting a DMABUF",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64042.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.