Linux Kernel vmwgfx Integer Overflow Local Privilege Escalation Vulnerability

July 15th, 2026
ZDI-26-443 ZDI-CAN-31467

CVE ID

CVSS Score

8.8 AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected Vendors

Linux

Affected Products

Kernel

Vulnerability Details

This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the handling of surface allocations. The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow before allocating a buffer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel.

Additional Details

Linux has issued an update to correct this vulnerability. More details can be found at:
https://lore.kernel.org/dri-devel/20260623193314.506257-1-ian.forbes@broadcom.com/T/#u

Disclosure Timeline

  • 2026-06-19 - Vulnerability reported to vendor
  • 2026-07-15 - Coordinated public release of advisory
  • 2026-07-15 - Advisory Updated

Credit

Pumpkin (@u1f383) from DEVCORE Research Team

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