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Vulnerability DatabaseCVE-2022-49476
CVE-2022-49476:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2022-49476 affects the Linux kernel's mt76 wireless driver, specifically the mt7921 PCI device removal functionality. The vulnerability was discovered in the mt7921pciremove function where a race condition could occur during device removal, potentially leading to a kernel NULL pointer dereference (Kernel Git).
Technical details
The vulnerability occurs when mt7921irqhandler is called while devmfreeirq is being handled during device removal. The issue stems from freeing the mt76 device too early in the removal process, which can lead to a NULL pointer dereference at address 0x0000000000000008. This happens because the interrupt handler might still be accessing device resources after they've been freed (Kernel Git).
Impact
When triggered, this vulnerability causes a kernel crash due to NULL pointer dereference, resulting in a system panic. This can lead to system instability and potential denial of service conditions (Debian Security).
Mitigation and workarounds
The issue has been fixed by postponing the mt76freedevice call until after devmfreeirq is completed. The fix moves the mt76freedevice call from mt7921eunregisterdevice to mt7921pciremove, ensuring proper resource cleanup ordering. Fixed versions are available in various Linux distributions including Debian Bullseye (5.10.234-1) and Bookworm (6.1.129-1) (Debian Security).
Additional resources
Source: This report was generated using AI
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