An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp_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://security.netapp.com/advisory/ntap-20210805-0004/
https://security.gentoo.org/glsa/202107-44
https://lists.debian.org/debian-lts-announce/2023/03/msg00013.html
https://lists.debian.org/debian-lts-announce/2021/09/msg00000.html