CVE-2026-93822 Linux CVE debrief

Who should care

Linux kernel maintainers, Linux distribution maintainers, and users of Linux systems, especially those utilizing the PCI iproc component, should assess their exposure and verify the application of patches.

Why it matters

CVE-2026-93822 is a vulnerability in the Linux kernel's PCI iproc component that could lead to system instability if not properly patched. Linux kernel maintainers and users should assess exposure and apply patches to prevent potential issues.

• Verification of patch application is required to prevent potential use-after-free issues.
• System crashes could occur if the vulnerability is not properly addressed.
• Maintainers and users must validate the fix in their specific environments.

Technical summary

The Linux kernel's PCI iproc component had a vulnerability that could lead to use-after-free issues or system crashes due to improper protection of root bus removal during concurrent rescan or hotplug operations. The issue has been resolved by holding the pci_rescan_remove_lock lock while stopping and removing a root bus. This fix prevents potential use-after-free issues and system crashes by ensuring that root bus removal is properly synchronized with concurrent rescan or hotplug operations. Linux kernel maintainers and users should assess exposure and verify patches, prioritizing validation of the fix in their specific environments.

Defensive priority

Linux kernel maintainers and users should assess exposure and verify patches, prioritizing validation of the fix in their specific environments.

Recommended defensive actions

• Review and apply the provided patches from the Linux kernel Git repository.
• Validate the fix in your specific Linux kernel environment.
• Monitor for any potential issues related to concurrent rescan or hotplug operations.
• Perform a thorough review of system logs to detect any signs of exploitation.
• Update asset inventory to track affected systems and prioritize patching.
• Implement compensating controls, such as enhanced monitoring, for exposed systems.
• Establish a rollback plan in case patch application causes unforeseen issues.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability and its resolution. Three source references from the Linux kernel Git repository are provided, detailing the specific commits addressing the issue.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.