BPF LSM Hook Removal in Linux Kernel

Executive Summary

This vulnerability in the Linux kernel involves two BPF LSM hooks that cannot be used by sleepable LSM programs. bpf_lsm_task_to_inode() is called under rcu_read_lock() and bpf_lsm_inet_conn_established() runs in softirq context, making them unsuitable for sleepable LSM programs due to their execution environments.

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Detection Guidance

This vulnerability is specific to the Linux kernel's BPF LSM hooks and cannot be directly detected using standard network or system commands. It requires kernel source code analysis or specialized BPF tools to identify affected systems. Check kernel version against patched releases and review BPF LSM program usage.

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Impact Analysis

This vulnerability may allow bypass of certain security controls if sleepable LSM programs are incorrectly configured to use these hooks. It could lead to unauthorized access or privilege escalation in systems running affected Linux kernel versions.

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Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards. It involves a Linux kernel issue where certain BPF LSM hooks cannot be used by sleepable programs due to context constraints. There is no indication this impacts data protection, privacy, or security controls required by these regulations.

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Mitigation Strategies

Update the Linux kernel to the latest patched version to resolve this vulnerability. Monitor vendor advisories for kernel updates and apply them promptly.

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