crypto/pcrypt.c in the Linux kernel before 4.14.13 mishandles freeing instances, allowing a local user able to access the AF_ALG-based AEAD interface (CONFIG_CRYPTO_USER_API_AEAD) and pcrypt (CONFIG_CRYPTO_PCRYPT) to cause a denial of service (kfree of an incorrect pointer) or possibly have unspecified other impact by executing a crafted sequence of system calls.
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d76c68109f37cb85b243a1cf0f40313afd2bae68
www.securityfocus.com/bid/102813
access.redhat.com/errata/RHSA-2018:2948
github.com/torvalds/linux/commit/d76c68109f37cb85b243a1cf0f40313afd2bae68
usn.ubuntu.com/3619-1/
usn.ubuntu.com/3619-2/
www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.13