Executive Summary

This vulnerability exists in the Linux kernel's crypto subsystem, specifically in the ccp driver handling AES encryption with the rfc3686-ctr-aes-ccp algorithm. The issue arises because the driver expects an 8-byte initialization vector (IV) but incorrectly copies AES_BLOCK_SIZE (which is larger) bytes back into the IV buffer. This causes a buffer overrun since the buffer only has space for 8 bytes.

The root cause is that the function ccp_aes_complete() restores more bytes than the IV buffer can hold, leading to memory corruption. The fix involves using the correct IV size by calling crypto_skcipher_ivsize() to ensure only the appropriate number of bytes are copied.

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Impact Analysis

This vulnerability can lead to a buffer overrun in the kernel's crypto driver, which may cause memory corruption. Such memory corruption can potentially be exploited to cause system instability, crashes, or even allow an attacker to execute arbitrary code with kernel privileges.

Because this occurs in the cryptographic subsystem, it might also affect the integrity and confidentiality of encrypted data processed by the affected driver.

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