An out-of-bounds (OOB) memory access flaw was found in the Linux kernel's eBPF due to an Improper Input Validation. This flaw allows a local attacker with a special privilege to crash the system or leak internal information.
https://access.redhat.com/security/cve/CVE-2021-4204
https://bugzilla.redhat.com/show_bug.cgi?id=2039178
https://security-tracker.debian.org/tracker/CVE-2021-4204