Debian Linux - open-iscsi - None

Red Hat Enterprise Linux - open-iscsi: open-iscsi: Out-of-bounds access in iscsiuio ICMPv6 echo handling

Ubuntu Linux - [Unknown description]

The remote Debian 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4813 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4813-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Daniel Leidert     October 02, 2026                              https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : open-iscsi     Version        : 2.1.8-1+deb12u1     CVE ID         : CVE-2026-18724 CVE-2026-18725 CVE-2026-18726 CVE-2026-18727                      CVE-2026-18728 CVE-2026-44943 CVE-2026-44944     Debian Bug     : 1143059 1144935

    Multiple vulnerabilities were found in open-iscsi, a high-performance,     transport independent, multi-platform implementation of RFC3720 iSCSI.

    CVE-2026-18724

       A stack buffer overflow exists in idbm_recinfo_config.

    CVE-2026-18725

       An out-of-bounds access exists in the IPv6 ICMPv6 echo handling.

    CVE-2026-18726

       Multiple vulnerabilities exist in the ICMPv6 Router Advertisement        option parsing.

    CVE-2026-18727

       An integer underflow exists in the iscsiuio DHCPv6 parsing.

    CVE-2026-18728

       An integer underflow exists in the iscsiuio IPv4 DHCP parsing.

    CVE-2026-44943

       Improve iscsid discovery handling of IQN names.

    CVE-2026-44944

       An unprivilidged local user can use the isscsiuio control socket.

    For Debian 12 bookworm, these problems have been fixed in version     2.1.8-1+deb12u1.

    We recommend that you upgrade your open-iscsi packages.

    For the detailed security status of open-iscsi please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/open-iscsi

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: This is a digitally signed message part

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of iscsi-initiator-utils installed on the remote host is prior to 6.2.0.874-7. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3897 advisory.

    open-iscsi: open-iscsi: Stack buffer overflow in idbm record parsing (CVE-2026-18724)

    open-iscsi: open-iscsi: Out-of-bounds access in iscsiuio ICMPv6 echo handling (CVE-2026-18725)

    A flaw was found in open-iscsi. This vulnerability allows a remote attacker on the same local network     segment to cause a Denial of Service (DoS) in the iscsiuio daemon. By sending a specially crafted Internet     Control Message Protocol version 6 (ICMPv6) Router Advertisement with a zero-length option, the attacker     can trigger an infinite loop. This leads to sustained CPU usage, rendering the daemon unresponsive and     impacting system availability. A secondary risk of out-of-bounds reads exists with a short IPv6 payload,     though no memory corruption or data exposure has been confirmed. (CVE-2026-18726)

    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. (CVE-2026-18727)

    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. (CVE-2026-18728)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-2120 advisory.

    open-iscsi: open-iscsi: Stack buffer overflow in idbm record parsing (CVE-2026-18724)

    open-iscsi: open-iscsi: Out-of-bounds access in iscsiuio ICMPv6 echo handling (CVE-2026-18725)

    A flaw was found in open-iscsi. This vulnerability allows a remote attacker on the same local network     segment to cause a Denial of Service (DoS) in the iscsiuio daemon. By sending a specially crafted Internet     Control Message Protocol version 6 (ICMPv6) Router Advertisement with a zero-length option, the attacker     can trigger an infinite loop. This leads to sustained CPU usage, rendering the daemon unresponsive and     impacting system availability. A secondary risk of out-of-bounds reads exists with a short IPv6 payload,     though no memory corruption or data exposure has been confirmed. (CVE-2026-18726)

    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. (CVE-2026-18727)

    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. (CVE-2026-18728)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - open-iscsi: open-iscsi: Stack buffer overflow in idbm record parsing (CVE-2026-18724)  open-iscsi: open-     iscsi: Out-of-bounds access in iscsiuio ICMPv6 echo handling (CVE-2026-18725)  A flaw was found in open-     iscsi. This vulnerability allows a remote attacker on the same local network segment to cause a Denial of     Service (DoS) in the iscsiuio daemon. By sending a specially crafted Internet Control Message Protocol     version 6 (ICMPv6) Router Advertisement with a zero-length option, the attacker can trigger an infinite     loop. This leads to sustained CPU usage, rendering the daemon unresponsive and impacting system     availability. A secondary risk of out-of-bounds reads exists with a short IPv6 payload, though no memory     corruption or data exposure has been confirmed. (CVE-2026-18726)  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. (CVE-2026-18727)  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. (CVE-2026-18728) (CVE-2026-18725)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
362657	Debian dla-4813 : iscsiuio - security update	Nessus	Debian Local Security Checks	Local	high
341873	Amazon Linux 2 : iscsi-initiator-utils, --advisory ALAS2-2026-3897 (ALAS-2026-3897)	Nessus	Amazon Linux Local Security Checks	Local	medium
341851	Amazon Linux 2023 : iscsi-initiator-utils, iscsi-initiator-utils-devel, iscsi-initiator-utils-iscsiuio (ALAS2023-2026-2120)	Nessus	Amazon Linux Local Security Checks	Local	medium
334996	Linux Distros Unpatched Vulnerability : CVE-2026-18725	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-18725

medium

Tenable Plugins

high

medium

medium

medium