Memory Initialization Vulnerability in Linux Kernel Affecting J1939 Transport

CVE-2026-80707

What is CVE-2026-80707?

A vulnerability has been identified in the Linux kernel's J1939 transport subsystem related to improper initialization of receive buffers in the j1939_session_fresh_new() function. Specifically, the allocated buffers were not zeroed, which could lead to residual data exposure. Although this flaw has minimal performance impact in most scenarios—given that the maximum buffer size typically hovers around 65K—proper initialization of buffers is essential for maintaining system integrity and security.

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