CVE 2026 115484

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A flaw was found in the iscsiuio component of open-iscsi. The DHCPv4 option parser incorrectly calculates the length of the options data, causing it to read beyond the allocated buffer into adjacent heap memory. An attacker on the same network segment can send a crafted DHCP response to crash the daemon or corrupt its network configuration.

This flaw is rated Moderate because exploitation requires adjacent-network access to a Layer 2 segment where iscsiuio is processing IPv4 DHCP traffic on a hardware iSCSI offload NIC (Broadcom bnx2/bnx2x or QLogic qedi). Systems without iSCSI offload hardware are not affected. The iscsiuio daemon is socket-activated and only runs when the hardware is present and configured. iSCSI storage networks are typically isolated from general-purpose networks, further limiting attacker access.

Restrict untrusted systems from the L2 broadcast domain where iscsiuio-managed interfaces operate. If IPv4 DHCP is not required for iSCSI boot, configure static IP addressing. Where DHCP must remain enabled, limit DHCP/BOOTP traffic so only trusted infrastructure can reach the affected host.

Bugzilla 2556265 : open-iscsi: open-iscsi: DHCPv4 option parser heap out-of-bounds read in iscsiuio parse_msg

CWE-125 : Out-of-bounds Read

Common Vulnerability Scoring System (CVSS) Score Details

Info alert: Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications ).

The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 Score Breakdown

Red Hat: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

cve.org: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Red Hat CVSS v3 Score Explanation

DHCPv4 parse_msg 240-byte heap OOB read. C:L — heap data leaks into network config but attacker cannot observe it directly. I:L — attacker-influenced config via heap data. A:H — 240 bytes can cross page boundary, SEGV confirmed. Kept at 7.1 per AV:A OOB precedent review.

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