Bluetooth Use-After-Free in Linux Kernel

Executive Summary

This is a Linux kernel Bluetooth vulnerability where a use-after-free issue occurs in the hci_sync subsystem. The flaw involves passing a freed pointer to hci_conn_valid() which may have been reused by kmalloc, potentially leading to memory corruption or crashes.

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Detection Guidance

This vulnerability is specific to the Linux kernel's Bluetooth subsystem and requires kernel-level inspection. Detection involves checking kernel logs for Bluetooth-related errors or crashes, particularly around hci_sync or hci_past_sync functions. Use commands like dmesg | grep -i bluetooth or journalctl -k | grep -i bluetooth to review kernel logs for anomalies.

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Impact Analysis

An attacker could exploit this to cause system instability, crashes, or potentially execute arbitrary code in the kernel context. This may lead to denial of service or unauthorized access on affected systems using Bluetooth.

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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 Bluetooth subsystem and involves a memory management flaw that could lead to use-after-free scenarios. Compliance implications would depend on how the affected system is used and whether it handles sensitive data, but the vulnerability itself does not introduce regulatory non-compliance.

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Mitigation Strategies

Update the Linux kernel to the latest stable version that includes the fix for CVE-2026-74528. Monitor vendor advisories for kernel updates and apply patches promptly.

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