Description
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 2875fe0561569f82d0e63658ccf0d11ce7da8922, < ea22d4195cca13d5fdbc4d6555a2dfb8a7867a9e; >= 2875fe0561569f82d0e63658ccf0d11ce7da8922, < 3090c06d50eaa91317f84bf3eac4c265e6cb8d44; >= 2875fe0561569f82d0e63658ccf0d11ce7da8922, < 0c1f28c32a194303da630fca89481334b9547b80; >= 2875fe0561569f82d0e63658ccf0d11ce7da8922, < a638b0461b58aa3205cd9d5f14d6f703d795b4af |
| Linux | Linux | 5.7 |
References
- https://git.kernel.org/stable/c/0c1f28c32a194303da630fca89481334b9547b80Mailing List, Patch
- https://git.kernel.org/stable/c/3090c06d50eaa91317f84bf3eac4c265e6cb8d44Patch
- https://git.kernel.org/stable/c/a638b0461b58aa3205cd9d5f14d6f703d795b4afPatch
- https://git.kernel.org/stable/c/ea22d4195cca13d5fdbc4d6555a2dfb8a7867a9ePatch
- https://git.kernel.org/stable/c/0c1f28c32a194303da630fca89481334b9547b80Mailing List, Patch
- https://git.kernel.org/stable/c/3090c06d50eaa91317f84bf3eac4c265e6cb8d44Patch
- https://git.kernel.org/stable/c/a638b0461b58aa3205cd9d5f14d6f703d795b4afPatch
- https://git.kernel.org/stable/c/ea22d4195cca13d5fdbc4d6555a2dfb8a7867a9ePatch
Timeline
- Published
- Jun 24, 2024
- Last modified
- Jun 17, 2026
- NVD status
- Analyzed