CVE-2024-36885 in Linux
الملخص
بحسب VulDB • 30/06/2026
Based on the stack trace provided, here is an analysis of the issue.
### **Summary** This is a **kernel panic or crash in the `nouveau` open-source NVIDIA GPU driver**. The crash occurs during device initialization (`nvkm_udevice_new`) when the kernel attempts to probe and initialize the Nouveau DRM (Direct Rendering Manager) subsystem for an NVIDIA graphics card.
The error code `RAX: ffffffffffffffda` corresponds to `-EIO` (-5), which typically indicates a **hardware I/O error** or that the device is not responding correctly during initialization.
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### **Detailed Stack Trace Analysis**
1. **Entry Point**: * `__x64_sys_finit_module`: The user-space process (likely via `insmod`/`modprobe`) is loading a kernel module. * `do_initcall` / `nouveau_drm_probe`: This confirms the crash happens during the driver's initialization phase, specifically when probing for an NVIDIA PCI device.
2. **Driver Initialization**: * `nouveau_cli_init` → `nvif_device_ctor` → `nvif_object_ctor`: The Nouveau client interface is being set up. * `nvkm_ioctl` → `nvkm_udevice_new+0x10/0x10 [nouveau]`: **This is where the crash occurs.**
* `nvkm` is the core kernel mode driver for NVIDIA GPUs in Nouveau. * `udevice_new` suggests it's trying to create a new user-space device object or initialize hardware communication structures.
3. **Root Cause Indicators**: * The crash happens very early in the hardware interaction phase (`nvkm_udevice_new`). * This often points to: - Incompatible GPU firmware/BIOS. - Hardware failure (GPU or PCIe link). - Conflict with other drivers (e.g., `nvidia` proprietary driver, `vfio-pci`, or secure boot issues). - Kernel bug in the specific version of Nouveau being used.
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### **Common Causes & Solutions**
#### 1. **Secure Boot / Module Signing Issue** If Secure Boot is enabled and the kernel module isn't properly signed, it may fail to load correctly, leading to crashes during initialization. - **Fix**: Disable Secure Boot in BIOS/UEFI, or sign the `nouveau` module with a custom MOK (Machine Owner Key).
#### 2. **Conflict with Proprietary NVIDIA Driver** If you have both `nouveau` and `nvidia` drivers installed, they can conflict during boot if one isn't properly blacklisted. - **Fix**: Ensure `nouveau` is blacklisted in `/etc/modprobe.d/blacklist-nouveau.conf`: ```bash blacklist nouveau options nouveau modeset=0 ``` Then regenerate initramfs: ```bash sudo update-initramfs -u # Debian/Ubuntu sudo dracut --force # RHEL/Fedora ```
#### 3. **GPU Firmware Missing or Corrupt** Nouveau requires firmware files (usually in `/lib/firmware/nouveau`). If these are missing, the driver may crash during `nvkm_udevice_new`. - **Fix**: Reinstall firmware packages: - Debian/Ubuntu: `sudo apt install linux-firmware` - RHEL/Fedora: `sudo dnf reinstall kernel-firmware`
#### 4. **Hardware Issue** The `-EIO` error suggests the GPU may not be responding to PCIe configuration space reads or memory-mapped I/O requests. - **Fix**: - Reseat the GPU. - Try a different PCIe slot. - Check `dmesg | grep nouveau` for earlier errors before this crash (e.g., "GPU lockup", "PCIe error").
#### 5. **Kernel Bug** This specific crash in `nvkm_udevice_new+0x10/0x10` has been reported in older kernels with certain NVIDIA GPUs (especially Maxwell/Pascal architectures). - **Fix**: - Update your kernel to the latest stable version. - If using a very new GPU, consider that Nouveau may not fully support it yet; use the proprietary `nvidia` driver instead.
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### **Recommended Debugging Steps**
1. **Check Full dmesg Log**: ```bash sudo dmesg | grep -i nouveau sudo dmesg | grep -i nvidia ``` Look for errors *before* the crash (e.g., firmware load failures, PCIe AER errors
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