CVE-2024-50107 in Linux
Сводка
по VulDB • 29.05.2026
Based on the kernel call trace provided, here is an analysis of the crash:
### **1. Summary of the Crash** * **Error Type:** `Invalid Opcode` (`exc_invalid_op`) triggered by a bug check (`handle_bug`). * **Triggering Function:** `pmc_core_ssram_get_pmc` in the `intel_pmc_core` kernel module. * **Context:** The crash occurred during the initialization/probing of the Intel PMC (Platform Management Controller) core driver on a **Meteor Lake (MTL)** platform. * **Root Cause Hint:** The crash happens inside `pmc_core_ssram_get_pmc`, which is called from `pmc_core_ssram_init`. The presence of `iounmap` in the call trace (even if it's just a warning context) suggests potential issues with memory mapping or accessing unmapped/invalid MMIO regions.
### **2. Detailed Call Trace Analysis** 1. **`pmc_core_ssram_get_pmc+0x477/0x6c0 [intel_pmc_core]`**:
* This is the function where the invalid opcode exception occurred. * It is likely trying to read or write to a specific PMC register or SRAM region. * The `Invalid Opcode` error often indicates: * Execution of an undefined instruction (corrupted code). * Accessing a memory-mapped I/O region that returns an invalid opcode (rare but possible with certain hardware errata). * A bug in the driver code itself (e.g., jumping to an invalid address).
2. **`pmc_core_ssram_init+0x7f/0x110 [intel_pmc_core]`**:
* This function initializes the SRAM interface for the PMC. * It calls `pmc_core_ssram_get_pmc` to retrieve PMC information or configure SRAM.
3. **`mtl_core_init+0xda/0x130 [intel_pmc_core]`**:
* This is the Meteor Lake-specific initialization routine. * It calls `pmc_core_ssram_init`.
4. **`pmc_core_probe+0x27e/0x10b0 [intel_pmc_core]`**:
* The main probe function for the platform driver. * It calls `mtl_core_init`.
5. **Driver Loading Context**: * The crash happens during module loading (`load_module` -> `do_init_module` -> `platform_probe`). * This means the system is trying to initialize the Intel PMC driver at boot or when the module is inserted.
### **3. Likely Causes** 1. **Hardware/Platform Mismatch:** * The driver might be running on a Meteor Lake (MTL) system where the PMC hardware behaves differently than expected, or there is a known erratum. * The `intel_pmc_core` driver may not be fully stable or compatible with the specific BIOS/firmware version on your Meteor Lake machine.
2. **MMIO Access Issue:** * `pmc_core_ssram_get_pmc` might be accessing an MMIO region that is not properly mapped or is reserved. * The `iounmap` in the warning context suggests that memory mapping/unmapping operations are involved, and something went wrong with the address space.
3. **Kernel Bug in `intel_pmc_core`:** * There might be a bug in the `pmc_core_ssram_get_pmc` function for Meteor Lake platforms. This could be a regression in recent kernel versions.
4. **Corrupted Kernel Module:** * Less likely, but possible: the `intel_pmc_core.ko` module file is corrupted.
### **4. Recommended Actions**
#### **A. Immediate Workarounds** 1. **Blacklist the `intel_pmc_core` Module:** * If the system is booting but crashing during module load, you can try to prevent the module from loading. * Add `modprobe.blacklist=intel_pmc_core` to your kernel boot parameters (in GRUB). * **Note:** This may disable some power management features related to the PMC, but it should allow the system to boot.
2. **Update BIOS/UEFI Firmware:** * Check your motherboard/laptop manufacturer's website for BIOS updates. Meteor Lake is a new platform, and early BIOS versions may have bugs affecting PMC initialization.
3. **Update Kernel:** * If you are using an older kernel (e.g., 6.1, 6.2),
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