CVE-2026-98387

In the Linux kernel, the following vulnerability has been resolved:

s390/crypto: Fix skcipher walk return code handling in aes s390

The return codes from skcipher walk virt() were not properly checked before entering the processing loops in ecb aes crypt() and ctr aes crypt(). If skcipher walk virt() fails, the walk structure may be in an undefined state, and attempting to process data could lead to incorrect behavior or accessing uninitialized memory.

Add proper return code checking to ensure correct handling of the walk initialization and walk advance and eventually return to the caller with that return code.