Linux Kernel Logitech HID++ Protocol Flaw Allows Local Privilege Escalation
A use-after-free vulnerability in the Linux Kernel's Logitech HID++ protocol, CVE-2026-93826, allows local privilege escalation with a CVSS score of 7.8.
A critical use-after-free vulnerability has been discovered in the Linux Kernel's implementation of the Logitech HID++ protocol, enabling local privilege escalation. The flaw, assigned CVE-2026-93826, carries a CVSS score of 7.8, indicating a high severity for affected systems.
This vulnerability specifically resides within the kernel's handling of connection events. The root cause is a failure to properly validate the existence of an object before attempting to perform operations on it. This oversight allows an attacker, who has already gained the ability to execute low-privileged code on the target system, to exploit the flaw.
Successful exploitation of this use-after-free vulnerability allows an attacker to escalate their privileges to that of the kernel. This grants them the ability to execute arbitrary code with the highest level of system access, potentially leading to a complete compromise of the affected machine.
The Zero Day Initiative (ZDI) disclosed the vulnerability, with the initial report made to the vendor on June 10, 2026. A coordinated public release of the advisory occurred on October 29, 2026, the same day the advisory was updated. The vulnerability was discovered by Lucas Leong, who works with TrendAI Zero Day Initiative.
Linux has since issued an update to address this security flaw. The specific commit addressing the vulnerability can be found in the Linux kernel source code repository at https://github.com/torvalds/linux/commit/6df6b1f2c49678211f65647c300bc51dda02893b.
While the vulnerability requires local code execution as a prerequisite, its presence in the Linux Kernel means a wide range of devices and systems are potentially at risk. Users are strongly advised to apply the available patch as soon as possible to mitigate the risk of privilege escalation and arbitrary code execution.
This discovery highlights the ongoing need for robust security practices and timely patching of kernel-level vulnerabilities, as they can have profound implications for system security and integrity. The Logitech HID++ protocol is commonly used for various peripherals, underscoring the broad impact such flaws can have.