CVE-2023-54037 in Linux
Resumen
por VulDB • 2026-05-31
Based on the kernel oops log provided, here is a detailed analysis of the crash:
### **1. Root Cause** The crash is a **Null Pointer Dereference** (or invalid memory access) occurring in the **Intel Ice network driver** (`ice`).
* **Crashing Function:** `ice_get_ringparam` * **Module:** `ice` (Intel Ethernet Connection E800 Series driver) * **Trigger:** The function `rings_prepare_data` called `ice_get_ringparam`, which attempted to access a NULL or invalid pointer.
### **2. Call Trace Analysis** The stack trace shows the sequence of events leading to the crash:
1. **User Space Request:** * `__x64_sys_sendto` → `netlink_sendmsg` → `genl_rcv` → `ethnl_default_doit` * This indicates a user-space application (likely `ethtool`) sent a netlink message to query network interface parameters.
2. **Kernel Netlink Handling:** * `ethnl_default_doit` is the generic handler for ethtool netlink commands. * It calls `rings_prepare_data` to prepare data for ring parameters.
3. **Driver Crash:** * `rings_prepare_data` calls `ice_get_ringparam`. * `ice_get_ringparam` dereferences a pointer that is **NULL** or invalid, causing a page fault. * The CPU traps the fault (`asm_exc_page_fault`), leading to `exc_page_fault` → `page_fault_oops` → `__die`.
### **3. Key Registers & Flags** * **DR6: 00000000fffe0ff0**: Debug register indicating a breakpoint or single-step fault, but in this context, it's part of the page fault context. * **PKRU: 55555554**: Protection Keys for User-mode pages. Not directly related to the crash but shows the CPU state. * **Call Trace Pointer:** `ice_get_ringparam+0x22/0x50 [ice]`
* The crash occurred at offset `0x22` within the `ice_get_ringparam` function.
### **4. Likely Scenario** This bug typically occurs when: 1. The `ice` driver is loaded, but the network interface is not fully initialized. 2. A user-space tool (like `ethtool -g <interface>`) queries ring parameters before the driver has properly set up its internal data structures. 3. The driver's `get_ringparam` callback is invoked with a `net_device` structure that lacks valid private data (`priv`), leading to a NULL pointer dereference when accessing ring configuration.
### **5. Recommended Actions**
#### **A. Immediate Workaround** 1. **Avoid querying ring parameters** on the affected interface until the driver is stable. 2. **Restart the network interface** or reload the `ice` module: ```bash sudo ip link set <interface> down sudo modprobe -r ice sudo modprobe ice sudo ip link set <interface> up ``` 3. **Update `ethtool`**: Ensure you are using the latest version of `ethtool`, as some versions have workarounds for driver bugs.
#### **B. Long-Term Fix** 1. **Update the Kernel**: This bug may have been fixed in newer kernel versions. Check if your distribution has a newer kernel available. 2. **Update the `ice` Driver**: If you are using a custom or out-of-tree driver, ensure you have the latest version from [Intel's GitHub](https://github.com/intel/ice).
3. **Report the Bug**: If this is a recent kernel version, report it to the Linux kernel mailing list (LKML) or your distribution's bug tracker. Include: * Full `dmesg` output. * Kernel version (`uname -r`). * Steps to reproduce (e.g., `ethtool -g eth0`).
#### **C. Debugging (If you are a developer)** 1. **Check `ice_get_ringparam`**: Look at the source code in `drivers/net/ethernet/intel/ice/ice_ethtool.c`. 2. **Identify the NULL Pointer**: The crash at `+0x22` likely involves accessing `adapter->ring[i]` or similar, where `adapter` or `ring` is NULL.
3. **Add NULL Checks**: Ensure the function checks for valid pointers before derefer
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