Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 4211742f0f9e083188f4f0ada00d6eeeef31b7c7 before 606cc45e871e34b80a2f63874f069387a5b44176; affected b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 before c462e15497dc40abe369b3be7a2c91ac5d1be6f9; affected b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 before b5f92cc4e24a298bf390b0b189a4b888c0900161; affected b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 before 6ad6954492697681ebcfc1beb0eb384406cd4b65; affected b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 before eadd0c2c76aee6a738f17f251434c77db3c606c8; affected b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 before d5b2752a17efc165793ae38f2c24b5ed9c04ffde; affected b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 before 81bbcff0c053c4f5c711c31a9b72fc492bd96c3f; affected 3ca8a07f141fd8eec347a82bdfa4b94164f2bb97; affected 3ba83e46b591381e718007f55c9f831fd0cd7ee8; affected 5.15.47 before 5.15.212; affected 5.17.15 before 5.18; affected 5.18.4 before 5.19 |
| Linux / Linux | affected 5.19; unaffected 0 before 5.19; unaffected 5.15.212 through 5.15.*; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.97 through 6.12.*; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
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