GhostLock (CVE-2026-43499) — POCO F3 GT (aresin)

Data-only physmap overwrite exploit for MediaTek Dimensity 1200 (MT6893). Kernel: 4.14.186-android13 / MIUI V14.0.4.0.TKJCNXM.

⚠️ Prerequisites

• Device: POCO F3 GT / Redmi K40 Gaming Edition (codename: aresin)
• Chipset: MediaTek Dimensity 1200 (MT6893)
• OS: Android 13 / MIUI 14 (V14.0.4.0.TKJCNXM)
• Kernel: 4.14.186-g0dc1d312efb3
• No bootloader unlock required — shell privileges can be obtained via Shizuku (wireless debugging) to run
• Shizuku or adb shell can execute arm64 binaries
• After running, the device will reboot (kernel panic — expected behavior). To save logs, connect adb logcat beforehand.

✅ Vulnerability Condition Check

🔧 Adaptation Steps

Step 1: Extract kernel symbol addresses

# 在设备上运行提取脚本
adb push tools/extract_offsets.sh /data/local/tmp/
adb shell sh /data/local/tmp/extract_offsets.sh
adb pull /data/local/tmp/ghostlock_offsets.txt

If you have root (Magisk), you can extract directly from /proc/kallsyms:

adb shell su -c "cat /proc/kallsyms | grep -E 'init_task|init_cred|entry_task|__per_cpu_offset|root_task_group|selinux_enforcing'"

Step 2: Extract vmlinux and analyze struct offsets

Method A: Extract vmlinux from boot.img

# 1. 获取 boot.img
adb shell "ls /dev/block/by-name/boot"
adb shell "dd if=/dev/block/by-name/boot of=/data/local/tmp/boot.img"
adb pull /data/local/tmp/boot.img

# 2. 用 magiskboot 解包
magiskboot unpack boot.img
# 产物: kernel (压缩的 vmlinux)

# 3. 解压 vmlinux
magiskboot decompress kernel vmlinux.elf

# 4. 用 pahole 提取结构体偏移
pahole --structs=rt_mutex_waiter vmlinux.elf
pahole --structs=task_struct vmlinux.elf | grep -A2 -E "usage|prio|normal_prio|pi_lock|pi_waiters|pi_top_task|pi_blocked_on|cred|real_cred|task_group"

Method B: Analyze with Ghidra

1. Open vmlinux.elf in Ghidra
2. Search for the rt_mutex_waiter and task_struct structs
3. Record the offset of each field

Step 3: Fill in target.h

Fill the extracted offsets into all 0xTODO placeholders in target.h.

Key offset reference table:

Step 4: Compile

# 需要 Android NDK r27+
export NDK_ROOT=/path/to/android-ndk-r27
# 或使用 Android Studio 中的 NDK
export NDK_ROOT=$HOME/Library/Android/sdk/ndk/27.0.12077973

# 编译
make preload TARGET_HEADER=target.h

# 产物: build/bin/preload.so

Step 5: Test

# 推送到设备
adb push build/bin/preload.so /data/local/tmp/
adb push build/bin/ghostlock_aresin /data/local/tmp/ 2>/dev/null || true

# 运行
adb shell LD_PRELOAD=/data/local/tmp/preload.so /data/local/tmp/ghostlock_aresin

# 或用 Shizuku
# 在 Shizuku 中执行: LD_PRELOAD=/data/local/tmp/preload.so /data/local/tmp/ghostlock_aresin

📊 Expected Behavior

⚠️ Important Notes

4.14.x vs 6.1.x Kernel Differences

1. rt_mutex_waiter struct differs:

   • 4.14.x uses plist_node instead of rb_node
   • Field offsets are completely different
   • May not have deadline / ww_ctx fields

2. task_struct layout differs:

   • Offsets of pi_blocked_on, pi_lock, etc. in 4.14.x differ from 6.1.x
   • uclamp-related fields may not exist in 4.14.x

3. KASLR implementation differs:

   • 4.14.x KASLR randomization differs from 6.1.x
   • The leak method may need adjustment

4. Android 13 vs 14 security differences:

   • SELinux policy may differ
   • /proc/self/pagemap access restrictions may differ

Offset Verification

After filling in offsets, cross-verify with Ghidra:

1. Open vmlinux.elf in Ghidra
2. Jump to the rt_mutex_waiter struct
3. Confirm that each field's offset matches target.h

📁 File Structure

ghostlock-aresin/
├── README.md              # 本文件
├── Makefile               # 编译脚本
├── target.h               # 目标设备偏移定义 (需要填写)
├── src/                   # 源码
│   ├── main.c             # 主利用逻辑
│   ├── util.c             # 工具函数
│   ├── slide.c            # KASLR 泄漏
│   ├── fops.c             # 文件操作
│   ├── pipe.c             # pipe 相关
│   ├── preload.c          # LD_PRELOAD 入口
│   ├── su_daemon.c        # su 守护进程
│   ├── su_blob.S          # su 二进制嵌入
│   ├── standalone.c       # 独立运行
│   ├── common.h           # 公共定义
│   └── offset.h           # 偏移计算
├── tools/
│   └── extract_offsets.sh # 偏移提取脚本
└── build/
    ├── bin/               # 编译产物
    └── embed/             # 嵌入文件

📜 License

For research/educational purposes only. Use at your own risk.

Original PoC: NebuSec/CyberMeowfia → IonStack/CVE-2026-43499/exploit/ Adapted for: POCO F3 GT (aresin) by ghostlock-aresin