CVE-2026-15813

Name	CVE-2026-15813
Description	A vulnerability was found in the network packet de-fragmentation engine of kronosnet (Version affected <= 1.34). The internal reassembly code does not properly validate sequence numbers of incoming payload fragments. An attacker can exploit this lack of verification by transmitting malformed packets with corrupted sequence parameters. Under specific conditions, this forces the packet processing layer to parse data outside the designated bounds of the internal memory structures, causing an out-of-bounds memory access or heap corruption. This behavior can result in sudden application crashes or system instability.
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	1142847

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
kronosnet (PTS)	bullseye	1.20-4	vulnerable
	bookworm	1.25-1	vulnerable
	trixie	1.31-1	vulnerable
	forky, sid	1.33-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
kronosnet	source	(unstable)	(unfixed)			1142847

Notes

[trixie] - kronosnet <no-dsa> (Minor issue)
[bookworm] - kronosnet <postponed> (Minor issue)
[bullseye] - kronosnet <postponed> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=2500854