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CVE-2026-52951 Linux CVE debrief

CVE-2026-52951 is a high-severity Use-After-Free vulnerability in the Linux kernel's drm/xe/dma-buf component. The vulnerability arises from improper handling of empty buffer objects and Use-After-Free (UAF) races when triggering the invalidate_mappings hook. Attackers could potentially exploit this vulnerability to cause system crashes or execute arbitrary code. The issue was resolved by moving the attach step until after the buffer object is fully set up. This change prevents the buffer object from being visible on the attachments list before it is fully initialized, thus mitigating the risk of UAF and other potential bugs. The vulnerability has a CVSS score of 7.8 and is considered HIGH severity.

Vendor
Linux
Product
Unknown
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-24
Original CVE updated
2026-06-28
Advisory published
2026-06-24
Advisory updated
2026-06-28

Who should care

System administrators and security teams responsible for Linux kernel-based systems, particularly those using the drm/xe/dma-buf component, should be aware of this vulnerability. Given its high severity and potential for exploitation, prioritizing patching or mitigation strategies is crucial. Additionally, developers working on Linux kernel modules or components interacting with drm/xe/dma-buf should consider the implications of this vulnerability on their work.

Technical summary

The CVE-2026-52951 vulnerability is a Use-After-Free (UAF) issue in the Linux kernel's drm/xe/dma-buf component. It occurs due to races when triggering the invalidate_mappings hook, specifically when handling empty buffer objects or when buffer objects are freed prematurely. The vulnerability can lead to potential crashes or code execution. The fix involves reordering operations to ensure that buffer objects are fully set up before being attached, thus preventing premature exposure to potential attackers.

Defensive priority

High

Recommended defensive actions

  • Apply the official patch provided by the Linux kernel maintainers to address the UAF vulnerability in drm/xe/dma-buf.
  • Review and update Linux kernel versions to ensure that the patched version is deployed.
  • Implement monitoring and logging to detect potential exploitation attempts.
  • Perform thorough inventory checks to identify affected systems and prioritize patching.
  • Consider compensating controls, such as enhanced monitoring or access restrictions, for systems that cannot be patched immediately.

Evidence notes

The CVE-2026-52951 vulnerability was identified and resolved through a series of commits to the Linux kernel. The issue was reported by multiple customers experiencing NULL pointer dereferences when importing from amdgpu and triggering the evict flow. Analysis suggested that the problem was due to races involving empty or freed buffer objects. The fix was verified and backported to stable kernel versions.

Official resources

This AI-assisted CVE debrief is based on the supplied source corpus and is intended for informational purposes only. It provides a summary of CVE-2026-52951, a high-severity vulnerability in the Linux kernel's drm/xe/dma-buf component. The