The armv8_dec_aes_gcm_full() API of Arm AArch64cryptolib before 86065c6 fails to the verify the authentication tag of AES-GCM protected data, leading to a man-in-the-middle attack. This occurs because of an improperly initialized variable.
https://github.com/ARM-software/AArch64cryptolib/security/advisories/GHSA-47c6-7x5x-r74g