CVE-2023-52817 in Linux
Riassunto
di VulDB • 20/06/2026
Based on the kernel log snippet provided, here is an analysis of the crash:
### **1. Crash Type: Null Pointer Dereference** - **`CR2: 0000000000000000`**: This is the most critical piece of information. `CR2` holds the linear address that caused the page fault. A value of `0x0` indicates a **null pointer dereference**. - **`RAX: ffffffffffffffda`**: This is likely the return value from a failed function call (e.g., `-22` for `EINVAL` or similar error codes in two's complement), suggesting the code tried to use a pointer that was invalid or null.
### **2. Faulting Instruction** - **`RIP: 0x7f5e07672992`**: The crash occurred in user-space or a kernel module mapped at this address. Given the high address (`0x7f5e...`), this is likely a **user-space application** or a **kernel module loaded in high memory**. - **`Code:`**: The assembly code snippet shows a system call or library function entry (`syscall` instruction `0f 05`), followed by a conditional jump (`75 10` = `jne`). This suggests the crash happened during a system call or a glibc/libc function.
### **3. Loaded Modules** The kernel was loaded with several modules, including: - **`amdgpu(OE)`**: AMD GPU driver (Out-of-tree/External). - **`igb`**: Intel Gigabit Ethernet driver. - **`nf_tables`, `ip_tables`**: Networking/firewall modules. - **`kvm_amd`, `kvm`**: AMD Virtualization support. - **`ast`**: ASPEED BMC GPU driver.
### **4. Likely Cause** Since `CR2=0` and the crash is in a high-memory address (`0x7f5e...`), this is **most likely a user-space application crash** that triggered a kernel panic due to an unhandled exception, or a **bug in a kernel module** that passed a null pointer to a system call.
#### **Possible Scenarios:** 1. **User-Space Bug**: An application (e.g., a graphics app using `amdgpu`, or a network tool) passed a null pointer to a system call (e.g., `read()`, `write()`, `ioctl()`), causing a kernel panic. 2. **Kernel Module Bug**: A kernel module (e.g., `amdgpu`, `igb`, or `nf_tables`) dereferenced a null pointer during a system call. 3. **Hardware/Driver Issue**: The `amdgpu` driver (marked as `OE` = Out-of-Tree/External) may have a bug causing a null pointer dereference when interacting with user-space.
### **5. How to Debug Further** To pinpoint the exact cause, you need more context: 1. **Check `dmesg` for the full stack trace**: ```bash dmesg | grep -A 50 "RIP:" ``` Look for the **call trace** (`Call Trace:`) to see which function was executing.
2. **Identify the crashing process**: ```bash dmesg | grep -B 10 "RIP:" ``` This may show the process name and PID that caused the crash.
3. **Check for recent changes**: - Did you recently update the `amdgpu` driver or kernel? - Are you running any custom/out-of-tree modules?
4. **Reproduce the crash**: - If it happens during a specific operation (e.g., gaming, network transfer), try to isolate the trigger.
### **6. Immediate Workaround** - If this is a **user-space app**, update or reinstall the application. - If this is a **kernel module**, consider: - Updating the kernel to the latest stable version. - Disabling the problematic module (e.g., `amdgpu`) temporarily to see if the crash stops. - Reporting the bug to the kernel maintainers or the module author.
### **Summary** - **Cause**: Null pointer dereference (`CR2=0`). - **Location**: Likely in a user-space application or a kernel module (`amdgpu`, `igb`, etc.). - **Next Step**: Check the full `dmesg` output for the call trace and identify the crashing process.
VulDB is the best source for vulnerability data and more expert information about this specific topic.