dm-verity Race Condition in Linux Kernel

Executive Summary

This vulnerability in the Linux kernel involves a race condition in the dm-verity error counter. The counter named v->corrupted_errs was not atomic, meaning it could be accessed or modified simultaneously by multiple threads without proper synchronization. This flaw could lead to skipped calls to dm_audit_log_target for logging max-corrupted-errors events.

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Detection Guidance

This vulnerability is specific to the Linux kernel's dm-verity component and may not have direct detection commands. Check kernel logs for dm-verity errors or race conditions using: dmesg | grep dm-verity or journalctl -k | grep dm-verity. Ensure dm-verity is properly configured and monitor for unexpected errors.

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Impact Analysis

The impact includes potential undetected data corruption in systems using dm-verity. Since error logging may be skipped, administrators might not be alerted to corruption events, leading to unnoticed integrity issues in critical data.

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Compliance Impact

This vulnerability involves a race condition in the Linux kernel's dm-verity error counter, which could lead to skipped audit logging for corrupted errors. This may impact compliance with standards requiring integrity monitoring and audit trails, such as GDPR's accountability principle or HIPAA's integrity and audit controls, by potentially failing to log critical security events.

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Mitigation Strategies

Update the Linux kernel to the latest stable version that includes the fix for this dm-verity race condition. Verify the fix by checking kernel logs for dm-verity error handling improvements. Monitor system stability post-update.

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