An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp6_input() function and could occur while processing a udp packet that is smaller than the size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.
https://bugzilla.redhat.com/show_bug.cgi?id=1970487
https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html
https://lists.debian.org/debian-lts-announce/2023/03/msg00013.html