A Use of Uninitialized Resource in the Linux kernel driver for Human Interface Devices (HID) in Junos OS Evolved allows a local low-privileged attacker to use a malicious input device to read information from the report buffer. This could be used to leak kernel memory, enabling the exploitation of additional vulnerabilities.

The method of practical exploitation of this vulnerability has been under significant debate industry-wide since it was originally published by the Linux Kernel developers. Successful exploitation requires access to the physical USB port on the device as well as local authenticated access to the CLI.

This issue affects Junos OS Evolved: 

• All versions before 22.4R3-S9-EVO, 
• from 23.2 before 23.2R2-S5-EVO, 
• from 23.4 before 23.4R2-S6-EVO, 
• from 24.2 before 24.2R2-S3-EVO, 
• from 24.4 before 24.4R2-S1-EVO, 
• from 25.2 before 25.2R1-S1-EVO, 25.2R2-EVO.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was discovered by a third-party upstream provider.

The following software releases have been updated to resolve this specific issue: 22.4R3-S9-EVO, 23.2R2-S5-EVO, 23.4R2-S6-EVO, 24.2R2-S3-EVO, 24.4R2-S1-EVO, 25.2R1-S1-EVO, 25.2R2-EVO, 25.4R1-EVO, and all subsequent releases.

This issue is being tracked as 1892248 which is visible on the Customer Support website.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).

There are no known workarounds for this issue.

2026-01-14: Initial Publication

• KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process [juniper.net]
• KB16765: In which releases are vulnerabilities fixed? [juniper.net]
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories [juniper.net]
• Report a Security Vulnerability - How to Contact the Juniper Networks Security Incident Response Team