A single-byte, non-arbitrary write/use-after-free flaw was found in dnsmasq. This flaw allows an attacker who sends a crafted packet processed by dnsmasq, potentially causing a denial of service.
https://bugzilla.redhat.com/show_bug.cgi?id=2057075
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016272.html