CVE-2026-72013

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

riscv: Prevent NULL pointer dereference in machine_kexec_prepare()

A NULL pointer dereference issue is noticed in riscv's

machine_kexec_prepare(), where image->segment[i].buf might be NULL and

copied unchecked.

The NULL buf comes from ima_add_kexec_buffer(), where kbuf is added by

kexec_add_buffer(), but kbuf.buffer is NULL, then it is copied without

a check in machine_kexec_prepare():

kexec_file_load

-> kimage_file_alloc_init()

-> kimage_file_prepare_segments()

-> ima_add_kexec_buffer()

-> kexec_add_buffer()

-> machine_kexec_prepare()

-> memcpy()

Address this by adding a check before the data copy attempt.