Bluetooth ISO Socket Connection Use-After-Free in Linux Kernel

Executive Summary

This is a Linux kernel Bluetooth vulnerability where the iso_connect_ind function accesses iso_pi(sk)->conn without proper locking. The function does not hold lock_sock, which is required for safe access. Additionally, iso_pi(sk)->conn may be NULL if the socket transitions away from LISTEN or CONNECT states before locking. The fix involves adding lock and release operations around this access and rechecking the hcon pointer after acquiring the lock.

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Detection Guidance

This vulnerability is specific to the Linux kernel's Bluetooth ISO implementation. Detection requires checking kernel logs for Bluetooth-related errors or crashes. Monitor logs with 'dmesg | grep -i bluetooth' or 'journalctl -k | grep -i bluetooth'. If the system uses affected kernel versions, look for warnings about iso_connect_ind or socket state transitions.

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Impact Analysis

This vulnerability could lead to race conditions in Bluetooth ISO socket connections, potentially causing crashes, memory corruption, or unauthorized access if exploited. Systems using affected Linux kernel versions with Bluetooth functionality may experience instability or security breaches.

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Compliance Impact

This vulnerability does not provide sufficient information to determine its impact on compliance with standards like GDPR or HIPAA. The issue is specific to Bluetooth ISO socket handling in the Linux kernel and does not describe data exposure or privacy risks directly relevant to these regulations.

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Mitigation Strategies

Apply the latest kernel update provided by your Linux distribution to patch the Bluetooth ISO vulnerability. If immediate patching is not possible, disable Bluetooth services temporarily with 'systemctl stop bluetooth' or restrict Bluetooth functionality via kernel module blacklisting (e.g., 'modprobe -r btiso').

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