RTL89 PHY Status IE Length Validation Flaw

Executive Summary

This is a vulnerability in the Linux kernel's wifi driver rtw89. It involves the PHY status IE parser accessing memory outside expected bounds due to improper length validation. Hardware may send PHY status IE with incorrect length, causing the parser to read invalid data.

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Detection Guidance

This vulnerability involves improper handling of PHY status IE length in the Linux kernel's rtw89 WiFi driver. Detection requires checking for kernel logs or driver errors related to rtw89 or PHY status parsing. Monitor system logs with commands like 'dmesg | grep rtw89' or 'journalctl -k | grep rtw89' to identify out-of-range access attempts.

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Impact Analysis

This could lead to system crashes, unexpected behavior, or potential privilege escalation if exploited. Users might experience WiFi connectivity issues or system instability due to memory corruption.

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Mitigation Strategies

Immediate mitigation involves updating the Linux kernel to a patched version that includes the fix for this issue. Check your distribution's security updates or kernel patches. If no patch is available, consider disabling the rtw89 driver if not in use or applying a vendor-supplied fix.

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