CVE-2024-38667

In the Linux kernel, the following vulnerability has been resolved: riscv: prevent pt_regs corruption for secondary idle threads Top of the kernel thread stack should be reserved for pt_regs. However this is not the case for the idle threads of the secondary boot harts. Their stacks overlap with their pt_regs, so both may get corrupted. Similar issue has been fixed for the primary hart, see c7cdd96eca28 ("riscv: prevent stack corruption by reserving task_pt_regs(p) early"). However that fix was not propagated to the secondary harts. The problem has been noticed in some CPU hotplug tests with V enabled. The function smp_callin stored several registers on stack, corrupting top of pt_regs structure including status field. As a result, kernel attempted to save or restore inexistent V context.

The following products are affected by CVE-2024-38667 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2024-38667.

URL	Resource
https://git.kernel.org/stable/c/0c1f28c32a194303da630fca89481334b9547b80
https://git.kernel.org/stable/c/3090c06d50eaa91317f84bf3eac4c265e6cb8d44
https://git.kernel.org/stable/c/a638b0461b58aa3205cd9d5f14d6f703d795b4af
https://git.kernel.org/stable/c/ea22d4195cca13d5fdbc4d6555a2dfb8a7867a9e
https://lore.kernel.org/linux-cve-announce/2024062431-CVE-2024-38667-83a6@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2024-38667
https://www.cve.org/CVERecord?id=CVE-2024-38667