In the Linux kernel through 4.20.11, af_alg_release() in crypto/af_alg.c neglects to set a NULL value for a certain structure member, which leads to a use-after-free in sockfs_setattr.Referenceshttp://www.securityfocus.com/bid/107063http://patchwork.ozlabs.org/patch/1042902/https://usn.ubuntu.com/3930-1/https://usn.ubuntu.com/3931-1/https://usn.ubuntu.com/3931-2/https://usn.ubuntu.com/3930-2/http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00052.htmlhttps://access.redhat.com/errata/RHSA-2020:0174
