CVE-2023-54148 in Linux
Сводка
по VulDB • 30.05.2026
Based on the stack trace provided, here is an analysis of the issue:
### **Summary** The system is experiencing a **kernel crash (Oops/Panic)** in the `mlx5_core` driver during the **unloading/cleanup phase** of an Mellanox ConnectX network device. The crash occurs specifically in `mlx5_esw_offloads_unpair`, which is part of the **switchdev offload** subsystem.
This typically happens when: 1. A network interface (vport) is being removed or reconfigured. 2. The driver attempts to clean up hardware offloads (e.g., TC rules, switchdev peerings). 3. A race condition, use-after-free, or invalid state occurs during the cleanup of **device composition (devcom)** structures.
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### **Key Stack Trace Analysis**
1. **`mlx5_esw_offloads_unpair+0x86/0x540 [mlx5_core]`**
- **Root Cause Location**: The crash happens here. This function is responsible for "unpairing" switchdev peers (e.g., removing offloaded connections between vports). - **Likely Issue**: The code is accessing memory that has already been freed, or a pointer is NULL/invalid, or a lock is held incorrectly.
2. **`mlx5_esw_offloads_devcom_event+0x203/0x530`** - This function handles events related to **device composition (devcom)**, which is used to synchronize state between multiple PFs (Physical Functions) or VFs in SR-IOV or multi-port configurations. - The crash is triggered by a devcom event during cleanup.
3. **`mlx5_esw_offloads_devcom_cleanup+0xb0/0xd0`** - The cleanup of devcom structures is in progress.
4. **`mlx5e_tc_esw_cleanup` → `mlx5e_rep_tc_cleanup` → `mlx5e_cleanup_rep_tx`** - The cleanup is cascading down from TC (Traffic Control) offloads to the representor network device.
5. **`mlx5e_detach_netdev` → `mlx5e_netdev_change_profile` → `mlx5e_vport_rep_unload`** - The network device (vport representor) is being detached/unloaded.
6. **`mlx5_eswitch_unregister_vport_reps` → `auxiliary_bus_remove` → `device_del`** - The auxiliary device (representor) is being removed from the bus.
7. **`mlx5_rescan_drivers_locked` → `mlx5_unregister_device` → `mlx5_uninit_one` → `remove_one`** - The entire mlx5 device is being unregistered, likely due to: - Module unload (`rmmod mlx5_core`). - PCI device removal (hot-unplug). - System shutdown/reboot.
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### **Common Causes**
1. **Race Condition During Unload**: - A devcom event is being processed while the devcom structure is being freed. - This is a known class of bugs in mlx5 drivers, especially in older kernels.
2. **Invalid State in Switchdev Offloads**: - The hardware or driver state is inconsistent when `mlx5_esw_offloads_unpair` is called. - For example, a peer vport may have already been freed, but the current vport still tries to unpair with it.
3. **Kernel Bug in `mlx5_core`**: - This could be a regression or a known bug in a specific kernel version.
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### **Recommended Actions**
#### **1. Check Kernel Version** - Identify your kernel version: ```bash uname -r ``` - Search for known bugs in `mlx5_esw_offloads_unpair` for your kernel version. - Example: Search [kernel.org](https://lore.kernel.org/linux-net/) or [Mellanox/NVIDIA forums](https://community.mellanox.com/) for "mlx5_esw_offloads_unpair crash".
#### **2. Update Kernel/Driver** - If you are on an older kernel (e.g., < 5.15), consider updating to a newer LTS kernel. - NVIDIA/Mellanox often releases out-of-tree drivers (`mlx5_core` patches) that fix these issues.
#### **3. Workarounds** - **Disable Switchdev Offloads**: If you don’t need switchdev offloads (e.g., TC rules, hardware switching), you can disable them: ```bash # Disable switchdev mode ip link set dev <interface> type switchdev off
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