In the Linux kernel before 4.20.5, attackers can trigger a drivers/char/ipmi/ipmi_msghandler.c use-after-free and OOPS by arranging for certain simultaneous execution of the code, as demonstrated by a “service ipmievd restart” loop.
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=77f8269606bf95fcb232ee86f6da80886f1dfae8
lists.opensuse.org/opensuse-security-announce/2019-05/msg00037.html
www.securityfocus.com/bid/107145
cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.5
github.com/torvalds/linux/commit/77f8269606bf95fcb232ee86f6da80886f1dfae8
security.netapp.com/advisory/ntap-20190327-0002/
usn.ubuntu.com/3930-1/
usn.ubuntu.com/3930-2/