High [CVE-2026-64042] Check BAR resources before exporting a DMABUF
This high-severity Red Hat Linux advisory covers CVE-2026-64042 affecting Red Hat Enterprise Linux 10, Red Hat package: kernel.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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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. This vulnerability occurs because the Direct Memory Access Buffer (DMABUF) export mechanism does not adequately verify if Base Address Register (BAR) resources are properly reserved before allowing access.
A local attacker could exploit this by exporting a DMABUF, potentially gaining unauthorized access to unreserved system resources. This could lead to information disclosure or other unintended system behavior.
This vulnerability is rated as an Important severity because, although exploitation is restricted to local callers with access to VFIO device instances, improper validation allows unauthorized reading and manipulation of host hardware memory outside intended device boundaries.
The flaw requires direct interaction with assigned PCI devices utilizing DMA-BUF sharing, a setup typically limited to specialized virtualization or hardware-accelerated workloads. Standard enterprise installations on RHEL 8 and 9 do not include the vulnerable code path.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
- kernel-0:6.12.0-211.53.1.el10_2
- RHSA-2026:65334
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-0:6.12.0-211.53.1.el10_2, RHSA-2026:65334. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
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