AppArmor Policy Unpack Failure Due to Missing ACCEPT2 Allocation

Executive Summary

This vulnerability in the Linux kernel involves a failure in the AppArmor security module. When processing older policy data, the system attempts to allocate memory for an ACCEPT2 table. If this allocation fails, the code incorrectly sets an error message but proceeds as if successful, leading to a policydb with a missing required table. The fix ensures that a memory allocation failure returns an error code (-ENOMEM) through the proper failure path.

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Detection Guidance

This vulnerability affects the Linux kernel's AppArmor module and may lead to policy unpacking failures. Detection involves checking kernel logs for AppArmor-related errors or policy loading issues. Use commands like 'dmesg | grep -i apparmor' or 'journalctl -k | grep -i apparmor' to review system logs for failures.

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Impact Analysis

This vulnerability could allow an attacker to bypass AppArmor security policies if the ACCEPT2 table allocation fails. This might lead to unauthorized access or execution of malicious code on a system using affected Linux kernel versions with AppArmor enabled.

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Compliance Impact

This vulnerability in the Linux kernel's AppArmor module could potentially impact compliance with standards like GDPR or HIPAA by allowing unauthorized policy enforcement due to missing ACCEPT2 table allocation. If exploited, it might lead to improper access controls or policy enforcement failures, which are critical for maintaining data protection and security requirements under these regulations.

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Mitigation Strategies

Update the Linux kernel to the latest patched version. If using a distribution with AppArmor, ensure the AppArmor module is updated. Monitor kernel logs for policy loading errors after updates. Restart services dependent on AppArmor if necessary.

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