CVE-2026-72013
N/A
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
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 4211742f0f9e083188f4f0ada00d6eeeef31b7c7 < 606cc45e871e34b80a2f63874f069387a5b44176 | affected |
| Linux | Linux | b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 < c462e15497dc40abe369b3be7a2c91ac5d1be6f9 | affected |
| Linux | Linux | b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 < b5f92cc4e24a298bf390b0b189a4b888c0900161 | affected |
| Linux | Linux | b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 < 6ad6954492697681ebcfc1beb0eb384406cd4b65 | affected |
| Linux | Linux | b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 < eadd0c2c76aee6a738f17f251434c77db3c606c8 | affected |
| Linux | Linux | b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 < d5b2752a17efc165793ae38f2c24b5ed9c04ffde | affected |
| Linux | Linux | b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 < 81bbcff0c053c4f5c711c31a9b72fc492bd96c3f | affected |
| Linux | Linux | 3ca8a07f141fd8eec347a82bdfa4b94164f2bb97 | affected |
| Linux | Linux | 3ba83e46b591381e718007f55c9f831fd0cd7ee8 | affected |
| Linux | Linux | 5.15.47 < 5.15.212 | affected |
| Linux | Linux | 5.17.15 < 5.18 | affected |
| Linux | Linux | 5.18.4 < 5.19 | affected |
| Linux | Linux | 5.19 | affected |
| Linux | Linux | 0 < 5.19 | unaffected |
| Linux | Linux | 5.15.212 <= 5.15.* | unaffected |
| Linux | Linux | 6.1.178 <= 6.1.* | unaffected |
| Linux | Linux | 6.6.145 <= 6.6.* | unaffected |
| Linux | Linux | 6.12.97 <= 6.12.* | unaffected |
| Linux | Linux | 6.18.40 <= 6.18.* | unaffected |
| Linux | Linux | 7.1.5 <= 7.1.* | unaffected |
| Linux | Linux | 7.2-rc3 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/606cc45e871e34b80a2f63874f069387a5b44176
- https://git.kernel.org/stable/c/c462e15497dc40abe369b3be7a2c91ac5d1be6f9
- https://git.kernel.org/stable/c/b5f92cc4e24a298bf390b0b189a4b888c0900161
- https://git.kernel.org/stable/c/6ad6954492697681ebcfc1beb0eb384406cd4b65
- https://git.kernel.org/stable/c/eadd0c2c76aee6a738f17f251434c77db3c606c8
- https://git.kernel.org/stable/c/d5b2752a17efc165793ae38f2c24b5ed9c04ffde
- https://git.kernel.org/stable/c/81bbcff0c053c4f5c711c31a9b72fc492bd96c3f
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