CVE-2026-115484 Red Hat CVE debrief

Who should care

Defenders responsible for systems using open-iscsi, particularly those exposed to untrusted networks, should assess their exposure and prioritize patching. The vulnerability can be exploited by an attacker on the same network segment, which could lead to a crash of the daemon or corruption of its network configuration. Defenders should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Why it matters

Defenders should prioritize patching affected systems, particularly those exposed to untrusted networks, to prevent potential crashes or configuration corruption.

• Crash of the iscsiuio daemon, potentially disrupting network operations
• Corruption of network configuration, potentially leading to connectivity issues
• Potential for lateral movement or further exploitation if not properly patched

Technical summary

The iscsiuio component of open-iscsi incorrectly calculates the length of DHCPv4 option data, leading to a heap out-of-bounds read. An attacker on the same network segment can exploit this vulnerability to crash the daemon or corrupt its network configuration. The vulnerability is caused by a lack of proper validation of the length of the options data. The CVE Program record and NVD detail page provide additional information on the vulnerability. The vulnerability can be exploited by sending a crafted DHCP response.

Defensive priority

Defenders should prioritize patching affected systems, particularly those exposed to untrusted networks.

Recommended defensive actions

• Patch affected systems, particularly those exposed to untrusted networks
• Verify network configuration and monitor for suspicious activity
• Consider implementing compensating controls, such as network segmentation
• Review relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

The CVE record and source item provide details on the vulnerability, but do not specify affected versions or explicit remediation steps. The vulnerability is in the iscsiuio component of open-iscsi. The DHCPv4 option parser incorrectly calculates the length of the options data. The CVE Program record and NVD detail page provide additional information on the vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.