Integer Underflow Affecting iscsi-initiator-utils-devel package, versions <0:6.2.1.4-10.git2a8f9d8.amzn2023.0.4


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.19% (9th percentile)

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  • Snyk IDSNYK-AMZN2023-ISCSIINITIATORUTILSDEVEL-19476766
  • published1 Sept 2026
  • disclosed12 Aug 2026

Introduced: 12 Aug 2026

NewCVE-2026-18727  (opens in a new tab)
CWE-191  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 iscsi-initiator-utils-devel to version 0:6.2.1.4-10.git2a8f9d8.amzn2023.0.4 or higher.
This issue was patched in ALAS2023-2026-2120.

NVD Description

Note: Versions mentioned in the description apply only to the upstream iscsi-initiator-utils-devel package and not the iscsi-initiator-utils-devel package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1