CVE-2026-18728

Name	CVE-2026-18728
Description	A flaw was found in open-iscsi. An integer underflow vulnerability in the `iscsiuio` component, specifically during IPv4 Dynamic Host Configuration Protocol (DHCP) parsing, allows a remote attacker on the same local network segment to cause a denial of service. By sending a specially crafted IPv4/UDP DHCP reply, the attacker can trigger an out-of-bounds read, leading to the `iscsiuio` process crashing. This issue affects systems where `iscsiuio` is actively handling IPv4 DHCP traffic.
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	1144935

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
open-iscsi (PTS)	bookworm	2.1.8-1	vulnerable
	trixie	2.1.11-1+deb13u2	vulnerable
	forky, sid	2.1.12-2	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
open-iscsi	source	(unstable)	(unfixed)			1144935

Notes

[trixie] - open-iscsi <no-dsa> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=2463029
https://github.com/open-iscsi/open-iscsi/issues/543
https://github.com/open-iscsi/open-iscsi/pull/544
Fixed by: https://github.com/open-iscsi/open-iscsi/commit/0bdc1ab6718215e67a4acff1e711fc8c6693cff4