CVE-2026-72013

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux4211742f0f9e083188f4f0ada00d6eeeef31b7c7 < 606cc45e871e34b80a2f63874f069387a5b44176affected
LinuxLinuxb7fb4d78a6ade6026d9e5cf438c2a46ab962e032 < c462e15497dc40abe369b3be7a2c91ac5d1be6f9affected
LinuxLinuxb7fb4d78a6ade6026d9e5cf438c2a46ab962e032 < b5f92cc4e24a298bf390b0b189a4b888c0900161affected
LinuxLinuxb7fb4d78a6ade6026d9e5cf438c2a46ab962e032 < 6ad6954492697681ebcfc1beb0eb384406cd4b65affected
LinuxLinuxb7fb4d78a6ade6026d9e5cf438c2a46ab962e032 < eadd0c2c76aee6a738f17f251434c77db3c606c8affected
LinuxLinuxb7fb4d78a6ade6026d9e5cf438c2a46ab962e032 < d5b2752a17efc165793ae38f2c24b5ed9c04ffdeaffected
LinuxLinuxb7fb4d78a6ade6026d9e5cf438c2a46ab962e032 < 81bbcff0c053c4f5c711c31a9b72fc492bd96c3faffected
LinuxLinux3ca8a07f141fd8eec347a82bdfa4b94164f2bb97affected
LinuxLinux3ba83e46b591381e718007f55c9f831fd0cd7ee8affected
LinuxLinux5.15.47 < 5.15.212affected
LinuxLinux5.17.15 < 5.18affected
LinuxLinux5.18.4 < 5.19affected
LinuxLinux5.19affected
LinuxLinux0 < 5.19unaffected
LinuxLinux5.15.212 <= 5.15.*unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2-rc3 <= *unaffected

Weaknesses

References