The Linux kernel crypto nx module had a vulnerability where nx_crypto_ctx_shash_exit called nx_crypto_ctx_exit with a context pointer of the wrong type (nx_crypto_ctx * instead of crypto_tfm *). This type mismatch caused kernel oops due to invalid memory access, as demonstrated by a BUG message and call trace involving crypto_shash_exit_tfm and related functions. The patch fixes the argument type in nx_crypto_ctx_exit and removes an incorrect crypto_tfm_ctx call. A similar issue existed in nx_crypto_ctx_skcipher_exit but was not exploited in practice.

This vulnerability could cause kernel crashes (oops) due to invalid memory access when certain cryptographic context exit functions are called. This may lead to denial of service on affected systems. There is no evidence of exploitation in the wild or further impact such as privilege escalation.

A fix has been applied to the Linux kernel to correct the argument type in nx_crypto_ctx_exit and remove the invalid call. Users should update to a Linux kernel version that includes this fix. Patch status is not explicitly stated; check the vendor or Linux kernel advisories for the specific fixed versions and apply updates accordingly.