CVE-2026-48715

Name	CVE-2026-48715
Description	radvd is a router advertisement daemon for IPv6. Prior to version 2.21, the `radvdump` utility shipped with radvd contains a stack buffer overflow in the Route Information option parser. When processing a crafted ICMPv6 Router Advertisement, `print_ff()` copies up to 2032 bytes from attacker-controlled packet data into a 16-byte `struct in6_addr` on the stack, overflowing by up to 2016 bytes. Note that the main `radvd` daemon is not affected by the vulnerability. Version 2.21 patches the issue.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1138049

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
radvd (PTS)	bullseye	1:2.18-3	vulnerable
	bookworm	1:2.19-1	vulnerable
	forky, sid, trixie	1:2.20-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
radvd	source	(unstable)	(unfixed)	unimportant		1138049

https://github.com/radvd-project/radvd/security/advisories/GHSA-52px-gh9p-m379
Crash in CLI tool, no security impact