Oracle Linux: CVE-2018-18445: ELSA-2019-0512: kernel security, bug fix, and enhancement update (IMPORTANT)

In the Linux kernel 4.14.x, 4.15.x, 4.16.x, 4.17.x, and 4.18.x before 4.18.13, faulty computation of numeric bounds in the BPF verifier permits out-of-bounds memory accesses because adjust_scalar_min_max_vals in kernel/bpf/verifier.c mishandles 32-bit right shifts.
A security flaw was found in the Linux kernel in the adjust_scalar_min_max_vals() function in kernel/bpf/verifier.c. A faulty computation of numeric bounds in the BPF verifier permits out-of-bounds memory accesses because this function mishandles 32-bit right shifts. A local unprivileged user cannot leverage this flaw, but as a privileged user ("root") this can lead to a system panic and a denial of service or other unspecified impact. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.