Linux · Linux Kernel · CVE-2021-47027
**Name of the Vulnerable Software and Affected Versions**
Linux kernel (affected versions not specified)
**Description**
The issue is related to a kernel crash that occurs when the firmware for the mt7921 device fails to download or is missing. This results in a fatal exception and the kernel stopping secondary CPUs. The crash is triggered by an internal error in the `free msi irqs` function, which is part of the PCI MSI (Message Signaled Interrupts) handling code. The error is caused by a bug in the `mt7921 pci probe` function, which is responsible for probing the mt7921 device. The `pci disable msi` and `pci free irq vectors` functions are also involved in the call trace leading to the crash.
**Recommendations**
At the moment, there is no information about a newer version that contains a fix for this vulnerability.