PCI: pciehp: Fix infinite loop in IRQ handler upon power fault
Summary
GSD-2022-1000269: PCI: pciehp: Fix infinite loop in IRQ handler upon power fault. Affects Kernel versions >= 8edf5332c39340b9583cf9cba659eb7ec71f75b5, < 1db58c6584a72102e98af2e600ea184ddaf2b8af. No fix is published. How to fix ↓
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Background
The Kernel package is a critical component of the Linux operating system. It provides the core functionality and interfaces for the system's hardware and software components. The pciehp module within the Kernel is responsible for handling hot-plug events for PCI Express devices. It manages the insertion and removal of PCIe cards while the system is running. This vulnerability affects the pciehp module and can lead to an infinite loop in the IRQ handler when a power fault occurs.
Vulnerability Detail
The vulnerability arises from a flaw in the IRQ handler of the pciehp module. When a power fault event is encountered, the IRQ handler enters an infinite loop, causing the system to become unresponsive. This can lead to a denial-of-service (DoS) condition, rendering the affected system unusable. The vulnerability was introduced in version v5.7 of the Linux Kernel and has been fixed in version v5.15.20.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is essential to update the Linux Kernel to the fixed version to mitigate the risk of exploitation.
Conclusion
The PCI: pciehp vulnerability in the Linux Kernel's pciehp module can lead to an infinite loop in the IRQ handler upon encountering a power fault event. This can result in a denial-of-service (DoS) condition, rendering the affected system unresponsive. It is crucial to update the Linux Kernel to version v5.15.20 or later to mitigate the risk of exploitation. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to a denial-of-service (DoS) condition, rendering the affected system unresponsive and unusable.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and the Vulert Playground will analyze it for any open-source vulnerabilities, including this one.
No, only versions starting from v5.7 up to v5.15.19 are affected. The vulnerability has been fixed in version v5.15.20.
No, this vulnerability requires local access to the system in order to trigger the power fault event and exploit the flaw in the IRQ handler.
There is no known evidence of this vulnerability being exploited in the wild at the time of this report.
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