A bug within some AMD CPUs could allow a local admin-privileged attacker to run a SEV-SNP guest using stale TLB entries, potentially resulting in loss of data integrity.
CVSS Details
CVSS Score
5.3
Severity
MEDIUM
CVSS Vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N
Configurations (Affected Products)
No configuration data available.
AMD EPYC 7002系列（部分支持SEV-SNP的型号）
AMD EPYC 7003系列（部分支持SEV-SNP的型号）
AMD EPYC 9004系列（Genoa等支持SEV-SNP的型号）
其他启用SEV-SNP功能的AMD处理器
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
// CVE-2025-29934 PoC概念验证（概念性代码）
// 注意：实际硬件漏洞利用需要特殊环境
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
// Simulated TLB entry structure
typedef struct {
uint64_t virtual_address;
uint64_t physical_address;
uint64_t flags;
int valid;
} tlb_entry_t;
// Global TLB simulation
tlb_entry_t tlb_cache[16];
// Function to simulate stale TLB entry exploitation
int trigger_stale_tlb_exploit(void) {
printf("[*] Initiating CVE-2025-29934 simulation...\n");
// Step 1: Initialize TLB with entries
printf("[*] Step 1: Setting up initial TLB state...\n");
for (int i = 0; i < 4; i++) {
tlb_cache[i].virtual_address = 0x1000 + (i * 0x1000);
tlb_cache[i].physical_address = 0x400000 + (i * 0x1000);
tlb_cache[i].valid = 1;
}
// Step 2: Simulate page table update without TLB flush
printf("[*] Step 2: Simulating page table update (no flush)...\n");
// In real scenario, this would trigger SNP page state change
tlb_cache[0].physical_address = 0x500000; // Updated mapping
// Step 3: Trigger context switch
printf("[*] Step 3: Triggering VM context switch...\n");
// Step 4: Access through potentially stale TLB entry
printf("[*] Step 4: Attempting to access memory via stale entry...\n");
uint64_t vaddr = tlb_cache[0].virtual_address;
uint64_t paddr = tlb_cache[0].physical_address;
printf("[!] Virtual Address: 0x%lx -> Physical Address: 0x%lx\n", vaddr, paddr);
// Step 5: Verify data integrity impact
printf("[*] Step 5: Checking for data integrity violation...\n");
printf("[!] Potential integrity issue: accessing old mapping\n");
return 0;
}
int main(int argc, char *argv[]) {
printf("========================================\n");
printf("CVE-2025-29934 PoC Simulation\n");
printf("AMD SEV-SNP Stale TLB Entry Vulnerability\n");
printf("========================================\n\n");
if (geteuid() != 0) {
printf("[!] Warning: This exploit requires root/admin privileges\n");
printf("[!] Continuing in simulation mode...\n\n");
}
trigger_stale_tlb_exploit();
printf("\n[*] Simulation complete.\n");
printf("[*] Note: This is a conceptual demonstration.\n");
printf("[*] Actual exploitation requires AMD SEV-SNP hardware.\n");
return 0;
}