Overflow Vulnerability in Linux Kernel Affecting Cryptographic Operations

CVE-2026-63824

What is CVE-2026-63824?

A vulnerability exists in the Linux kernel related to the key management functionality which can lead to a buffer overflow. The issue arises from an incorrect calculation of the internal output buffer length in the keyctl_pkey_params_get_2() function. When a smaller-than-required buffer is provided by the caller, it may lead to an overflow, potentially allowing for unintended behavior or exploitation. This vulnerability has been addressed in recent updates by ensuring that the internal buffer is allocated with the correct maximum size based on the cryptographic primitives, thereby mitigating the risk of overflow.

References