PCI Root Bus Use-After-Free in Linux Kernel

Executive Summary

This vulnerability involves a race condition in the Linux kernel's PCI subsystem. When a root bus is stopped and removed, the system may not properly lock against concurrent operations like rescan or hotplug via sysfs. This can lead to use-after-free issues or system crashes.

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Detection Guidance

This vulnerability is specific to the Linux kernel's PCI subsystem and may not have direct network detection methods. To check if your system is affected, verify the kernel version and look for the presence of the vulnerable code path in the iproc PCI driver. Use commands like 'uname -a' to check the kernel version and 'lsmod | grep iproc' to see if the driver is loaded.

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Impact Analysis

If exploited, this flaw could cause system instability, crashes, or unexpected behavior during PCI device operations. Users might experience kernel panics, data corruption, or denial of service if malicious or accidental concurrent operations occur.

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Mitigation Strategies

Apply the latest kernel update provided by your Linux distribution to patch this vulnerability. If an update is not immediately available, avoid triggering PCI rescan or hotplug operations via sysfs until the patch is applied. Monitor system logs for crashes or use-after-free errors related to PCI operations.

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