CVE-2024-27062 in Linux
Zusammenfassung
von VulDB • 31.05.2026
Based on the kernel log snippet provided, here is an analysis of the crash and potential causes.
### **1. Summary of the Crash** * **Type:** **Page Fault** (`exc_page_fault` / `do_user_addr_fault`). * **Context:** The crash occurred in **user-space** code, not in the kernel itself. The kernel was handling a fault because a user-space process tried to access a memory address that was invalid or unmapped. * **RIP (Instruction Pointer):** `0x9b9870` * This is a **user-space address** (low virtual address, likely part of a shared library or executable loaded in the lower memory region). * It is **not** a kernel address (which would typically be `0xffffffff...` or `0xffff88...`). * **RAX:** `0x4` * Often indicates an error code or a small integer value being processed. * **Modules Loaded:** The system is running a Linux kernel with various networking, wireless (`iwlmvm`), and sound (`snd_sof`) modules. No obvious corrupted kernel module is listed in the immediate trace.
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### **2. Key Observations**
#### **A. It’s a User-Space Crash, Not a Kernel Panic** The stack trace shows: ``` do_user_addr_fault+0x208/0x860 exc_page_fault+0x7f/0x200 asm_exc_page_fault+0x26/0x30 RIP: 0033:0x9b9870 ``` - `do_user_addr_fault` means the CPU trapped a page fault while executing in user mode. - The kernel is **not** crashing; it is reporting that a **user application** caused a segmentation fault (SIGSEGV). - **Conclusion:** This is likely **not** a kernel bug. It is a bug in the user-space program that was running at the time.
#### **B. The Faulting Address: `0x9b9870`** - This address is very low in the virtual address space. - On 64-bit Linux, user-space addresses are typically in the range `0x00007f...` to `0x0000ffff...`. - An address like `0x9b9870` suggests: 1. **32-bit application:** If the process is a 32-bit binary, this is a normal user-space address. 2. **Null pointer dereference or invalid pointer:** The program tried to execute code at an invalid address. 3. **Corrupted function pointer:** A function pointer was overwritten with `0x9b9870` or similar, leading to an invalid jump.
#### **C. No Kernel Module Fault** - The `Modules linked in` list shows standard modules. There is no indication that a kernel module (like `iwlmvm` or `snd_sof`) caused the fault. - The crash happened in user space, so kernel modules are unlikely to be the direct cause unless they corrupted user-space memory (very rare).
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### **3. Likely Causes**
1. **Bug in the User-Space Application:** - The application had a null pointer dereference, use-after-free, or buffer overflow that corrupted a function pointer. - The application tried to jump to an invalid memory address (`0x9b9870`).
2. **Corrupted Shared Library:** - If the application uses shared libraries (`.so` files), one of them might be corrupted or mismatched.
3. **Hardware Issue (Less Likely but Possible):** - If this happens randomly across different applications, it could indicate faulty RAM. However, since it’s a specific address (`0x9b9870`), it’s more likely a software bug.
4. **32-bit Compatibility Issue:** - If you are running a 32-bit application on a 64-bit kernel, ensure that the 32-bit compatibility libraries (`libc6:i386`, etc.) are correctly installed and not corrupted.
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### **4. How to Debug Further**
#### **Step 1: Identify the Crashing Process** Look at the logs **before** this stack trace to find which process was running. You should see something like: ``` [ 4562.099xxx] process_name[PID]: segfault at 0000000000000000 ip 00000000009b9870 sp 00
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