Executive Summary

This vulnerability exists in the Linux kernel's dpaa2-switch component. It occurs when an invalid or out-of-bounds interface identifier (if_id) is received in the interrupt request (IRQ) handler.

Originally, the code did not properly check if the if_id was within valid bounds, which could lead to an out-of-bounds access. When such an invalid if_id was detected, the interrupt status was not cleared, causing the system to repeatedly handle the same interrupt.

This results in an interrupt storm, where the CPU is overwhelmed by continuous interrupts, potentially degrading system performance or causing instability.

The fix introduced a bounds check for if_id and ensured that the interrupt status is cleared even when an out-of-bounds if_id is detected, preventing the interrupt storm.

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Impact Analysis

If exploited or triggered, this vulnerability can cause an interrupt storm in the Linux kernel's dpaa2-switch component.

An interrupt storm can overwhelm the CPU with repeated interrupts, leading to degraded system performance, increased latency, or even system instability or crashes.

This can affect the reliability and availability of systems running vulnerable versions of the Linux kernel, especially those relying on dpaa2-switch functionality.

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Mitigation Strategies

The vulnerability is fixed by adding a bounds check for if_id in the IRQ handler of the dpaa2-switch driver in the Linux kernel. To mitigate this vulnerability, you should update your Linux kernel to a version that includes the fix from commit 31a7a0bbeb00.

This update ensures that out-of-bounds if_id values are detected and the interrupt status is properly cleared, preventing an interrupt storm.

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