CVE-2026-18727 is a vulnerability in Red Hat Enterprise Linux (RHEL)
Published on August 12, 2026
Open-iscsi: open-iscsi: integer underflow in iscsiuio dhcpv6 parsing
A flaw was found in open-iscsi's iscsiuio component. This vulnerability involves an integer underflow and out-of-bounds read during Dynamic Host Configuration Protocol for IPv6 (DHCPv6) packet parsing. Specifically, crafted DHCPv6 Advertise traffic with a short User Datagram Protocol (UDP) length can cause the DHCPv6 payload length to underflow. An unauthenticated attacker on an adjacent network segment can exploit this by sending specially crafted IPv6 UDP traffic while the client is in an active DHCPv6 exchange, leading to a denial of service due to a process crash or service disruption.
Vulnerability Analysis
Timeline
Reported to Red Hat.
Made public. 108 days later.
Weakness Type
What is an Integer underflow Vulnerability?
The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. This can happen in signed and unsigned cases.
CVE-2026-18727 has been classified to as an Integer underflow vulnerability or weakness.
Products Associated with CVE-2026-18727
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