The fix for CVE-2019-11599, affecting the Linux kernel before 5.0.10 was not complete. A local user could use this flaw to obtain sensitive information, cause a denial of service, or possibly have other unspecified impacts by triggering a race condition with mmget_not_zero or get_task_mm calls.
https://www.oracle.com/security-alerts/cpuApr2021.html
https://security.netapp.com/advisory/ntap-20200608-0001/
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.10
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.37
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.114
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14898
https://bugs.chromium.org/p/project-zero/issues/detail?id=1790