p PatchFirst

CVE-2026-18727

CVE-2026-18727 · Open-iscsi: open-iscsi: integer underflow in iscsiuio dhcpv6 parsing

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 6.5 · Medium · EPSS 0.2% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • red hat enterprise linux 10

    No fix published

  • red hat enterprise linux 9

    No fix published

  • open-iscsi Debian:12

    Versions
    • 2.1.8-1
    Affected ranges
    • ECOSYSTEM: < 2.1.8-1+deb12u1

    Update to 2.1.8-1+deb12u1

  • open-iscsi Debian:13

    Versions
    • 2.1.11-1
    • 2.1.11-1+deb13u1
    • 2.1.11-1+deb13u2
    • 2.1.11-2
    • 2.1.11-3
    • 2.1.11-4
    • 2.1.11-5
    • 2.1.11-6
    • 2.1.12-1
    • 2.1.12-2
    • 2.1.13-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • open-iscsi Debian:14

    Versions
    • 2.1.11-1
    • 2.1.11-2
    • 2.1.11-3
    • 2.1.11-4
    • 2.1.11-5
    • 2.1.11-6
    • 2.1.12-1
    • 2.1.12-2
    Affected ranges
    • ECOSYSTEM: < 2.1.13-1

    Update to 2.1.13-1

  • open-iscsi Ubuntu:14.04:LTS

    Versions
    • 2.0.873-3ubuntu7
    • 2.0.873-3ubuntu8
    • 2.0.873-3ubuntu9
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • open-iscsi Ubuntu:Pro:16.04:LTS

    Versions
    • 2.0.873-3ubuntu13
    • 2.0.873+git0.3b4b4500-13ubuntu3
    • 2.0.873+git0.3b4b4500-14ubuntu1
    • 2.0.873+git0.3b4b4500-14ubuntu3
    • 2.0.873+git0.3b4b4500-14ubuntu3.1
    • 2.0.873+git0.3b4b4500-14ubuntu3.2
    • 2.0.873+git0.3b4b4500-14ubuntu3.3
    • 2.0.873+git0.3b4b4500-14ubuntu3.4
    • 2.0.873+git0.3b4b4500-14ubuntu3.5
    • 2.0.873+git0.3b4b4500-14ubuntu3.6
    • 2.0.873+git0.3b4b4500-14ubuntu3.7
    • 2.0.873+git0.3b4b4500-14ubuntu3.7+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • open-iscsi Ubuntu:Pro:18.04:LTS

    Versions
    • 2.0.874-4ubuntu3
    • 2.0.874-4ubuntu4
    • 2.0.874-4ubuntu5
    • 2.0.874-5ubuntu1
    • 2.0.874-5ubuntu2
    • 2.0.874-5ubuntu2.1
    • 2.0.874-5ubuntu2.2
    • 2.0.874-5ubuntu2.3
    • 2.0.874-5ubuntu2.4
    • 2.0.874-5ubuntu2.6
    • 2.0.874-5ubuntu2.7
    • 2.0.874-5ubuntu2.9
    • 2.0.874-5ubuntu2.10
    • 2.0.874-5ubuntu2.11
    • 2.0.874-5ubuntu2.11+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • open-iscsi Ubuntu:20.04:LTS

    Versions
    • 2.0.874-7.1ubuntu3
    • 2.0.874-7.1ubuntu5
    • 2.0.874-7.1ubuntu6
    • 2.0.874-7.1ubuntu6.1
    • 2.0.874-7.1ubuntu6.2
    • 2.0.874-7.1ubuntu6.3
    • 2.0.874-7.1ubuntu6.4
    • 2.0.874-7.1ubuntu6.5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • open-iscsi Ubuntu:22.04:LTS

    Versions
    • 2.1.4-0ubuntu1
    • 2.1.4-0ubuntu2
    • 2.1.4-0ubuntu3
    • 2.1.4-0ubuntu4
    • 2.1.5-1ubuntu1
    • 2.1.5-1ubuntu1.1
    • 2.1.5-1ubuntu1.3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • open-iscsi Ubuntu:24.04:LTS

    Versions
    • 2.1.8-1ubuntu2
    • 2.1.9-3ubuntu1
    • 2.1.9-3ubuntu2
    • 2.1.9-3ubuntu3
    • 2.1.9-3ubuntu4
    • 2.1.9-3ubuntu5.1
    • 2.1.9-3ubuntu5.2
    • 2.1.9-3ubuntu5.3
    • 2.1.9-3ubuntu5.4
    • 2.1.9-3ubuntu5.5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • open-iscsi Ubuntu:26.10

    Versions
    • 2.1.11-3ubuntu3
    • 2.1.11-5ubuntu1
    • 2.1.11-5ubuntu4
    • 2.1.11-5ubuntu5
    • 2.1.11-5ubuntu6
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • open-iscsi Ubuntu:26.04:LTS

    Versions
    • 2.1.11-1ubuntu3
    • 2.1.11-3ubuntu1
    • 2.1.11-3ubuntu2
    • 2.1.11-3ubuntu3
    • 2.1.11-3ubuntu3.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

Check your server →