WiFi ACPI WGDS Table Validation Flaw in Linux Kernel

Executive Summary

This vulnerability in the Linux kernel's iwlwifi ACPI driver involves improper validation of the WGDS table revision index. The issue occurs when firmware provides an invalid revision value, leading to undefined behavior due to out-of-bounds bit shifting when checking tbl_rev.

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Detection Guidance

This vulnerability affects the Linux kernel's iwlwifi ACPI driver. Detection requires checking kernel logs for iwlwifi-related errors or examining ACPI table revisions. Use commands like dmesg | grep iwlwifi or journalctl -k | grep iwlwifi to inspect logs for invalid WGDS table revision errors.

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Impact Analysis

This flaw could allow an attacker with local access to trigger undefined behavior in the kernel, potentially causing system instability, crashes, or privilege escalation. It specifically affects systems using Intel iwlwifi wireless drivers.

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Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or other common standards and regulations. The issue is specific to the Linux kernel's iwlwifi ACPI driver and involves a bounds check failure in the WGDS table revision index validation. There is no indication that this vulnerability impacts data protection, privacy, or security controls required by these regulations.

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Mitigation Strategies

Update your Linux kernel to the latest stable version that includes the fix for this issue. Monitor vendor advisories for iwlwifi firmware updates. If immediate patching is not possible, consider disabling the affected ACPI functionality temporarily as a workaround.

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