CVE-2026-18728 Open-iscsi: open-iscsi: integer underflow in iscsiuio ipv4 dhcp parsing
A remote attacker on the local network can crash the iscsiuio process via a crafted DHCP reply, causing denial of service in open-iscsi.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-18728?
CVE-2026-18728 is a medium-severity vulnerability in Redhat Enterprise Linux, published on 13 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-191
Which versions are affected by CVE-2026-18728?
It affects 1 product.
Products include Redhat Enterprise Linux.
How do I fix CVE-2026-18728?
Apply the vendor's patch.
Is CVE-2026-18728 being exploited?
There is no known exploitation of CVE-2026-18728 in the wild and no public exploit code.
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Sources
Also known as AZL-95919, DEBIAN-CVE-2026-18728, GHSA-v5q9-q65g-v5rv, UBUNTU-CVE-2026-18728.