Executive Summary

CVE-2024-46741 exposes a double‑free bug in the Linux kernel’s fastrpc subsystem. During the mmap error path, the buffer is freed twice—once in fastrpc_req_munmap_impl() and again unconditionally via fastrpc_buf_free(). This memory corruption can lead to kernel crashes or, if exploited, privilege escalation. The issue is not yet listed in CISA KEV.

---

Authoritative CVE Metadata - CVSS Base Score: 7.8 (HIGH) - Published: 2024-09-18T08:15:03.430 - Last Modified: 2026-08-27T13:16:32.990

Original Description: In the Linux kernel, the following vulnerability has been resolved:

misc: fastrpc: Fix double free of 'buf' in error path

smatch warning: drivers/misc/fastrpc.c:1926 fastrpc_req_mmap() error: double free of 'buf'

In fastrpc_req_mmap() error path, the fastrpc buffer is freed in fastrpc_req_munmap_impl() if unmap is successful.

But in the end, there is an unconditional call to fastrpc_buf_free(). So the above case triggers the double free of fastrpc buf.

"As we are liberated from our own fear, our presence automatically liberates others."

— Nelson Mandela