CVE-2023-52978: 
Linux Kernel vulnerability analysis and mitigation

A vulnerability was identified in the Linux kernel affecting the RISC-V kprobe functionality. The issue was discovered when probing an illegal position would cause a kernel panic, particularly when CONFIG_RISCV_ISA_C is disabled (NVD).

The vulnerability occurs when the kprobe's ebreak instruction breaks the kernel's original code during probing of an illegal position. This can happen in scenarios such as when probing kernel_clone+0x16 with CONFIG_RISCV_ISA_C disabled, leading to a kernel stack corruption and subsequent panic. The issue manifests with error messages indicating 'Kernel stack is corrupted in: __do_sys_newfstatat+0xb8/0xb8' (NVD).

When exploited, this vulnerability results in a kernel panic, effectively causing a denial of service condition. The issue specifically affects systems running the Linux kernel on RISC-V architecture when using kprobes (NVD).

The vulnerability requires local access and can be triggered by attempting to probe an illegal position in the kernel code. A proof-of-concept exists that demonstrates the issue by using specific kprobe commands (NVD).

The vulnerability has been resolved by adding arch_check_kprobe in arch_prepare_kprobe to prevent probing of illegal positions, such as the middle of an instruction. This patch ensures that the kernel validates probe positions before execution (NVD).