Linux Kernel MCTP Routing Uninitialized Memory Information Disclosure Vulnerability

September 14th, 2026
ZDI-26-690 ZDI-CAN-28534

CVE ID

CVE-2026-45930

CVSS Score

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

Affected Vendors

Linux

Affected Products

Kernel

Vulnerability Details

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

The specific flaw exists within the handling of neighbor discovery messages. The issue results from the lack of proper initialization of memory prior to accessing it. An attacker can leverage this in conjunction with other vulnerabilities to 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://github.com/torvalds/linux/commit/a6a9bc544b675d8b5180f2718ec985ad267b5cbf

Disclosure Timeline

  • 2025-12-04 - Vulnerability reported to vendor
  • 2026-09-14 - Coordinated public release of advisory
  • 2026-09-14 - Advisory Updated

Credit

Syed Faraz Abrar (@farazsth98) from Zellic, and Pumpkin (@u1f383) from DEVCORE Research Team

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