Medium [CVE-2026-18725] Out-of-bounds access in iscsiuio ICMPv6 echo handling
This medium-severity Red Hat Linux advisory covers CVE-2026-18725 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat package: iscsi-initiator-utils.
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Summary
AI_ONLY_REPORT package: iscsi-initiator-utils-6.2.1.11-0.git4b3e853.el10 ------ Summary: Out-of-Bounds Write and Information Disclosure via Unvalidated IPv6 Payload Length: crafted ICMPv6 Echo Requests can cause `iscsiuio` to trust an inflated `ipv6_plen` larger than the actual received payload, leading to MTU-bounded out-of-bounds reads and a potential one-byte out-of-bounds write that may disclose data beyond the valid packet boundary.
Requirements to exploit: Adjacent-network access on the same L2 segment as a system running `iscsiuio` on an interface that processes IPv6/NDP traffic, plus the ability to send a crafted ICMPv6 Echo Request with a forged `IPv6.plen`. No authentication or user interaction is required.
Component affected: `iscsi-initiator-utils` (`iscsiuio`): `iscsiuio/src/uip/ipv6.c` in `ipv6_icmp_handle_echo_request()` and `ipv6_insert_protocol_chksum()`. Version affected: `iscsi-initiator-utils-6.2.1.11-0.git4b3e853.el10` when `iscsiuio` is processing IPv6/NDP traffic on a reachable interface.
Patch available: no released package fix established; proposed patch included below Version fixed: unknown Upstream coordination: Not notified. CVSS: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L - 6.3 (MEDIUM) AV:A - Reachability is limited to an attacker on the same L2 segment who can send crafted IPv6/ICMPv6 traffic to the affected interface.
- 6.2.1.11-0
- 6.2.1.11
Official advisory · high-confidence parse· fetched 24 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 24 days ago·verify at source
Mitigation checklist
- To mitigate this issue, ensure that `iscsiuio`-managed interfaces are restricted to trusted L2 network segments. If feasible for your operational environment, disable IPv6 on interfaces where `iscsiuio` is active and not strictly required to process IPv6 traffic. Alternatively, implement firewall rules to filter ICMPv6 Echo Requests before they reach the `iscsiuio` process on affected systems. Changes to network configurations may require a network service restart to take effect, which could temporarily impact network connectivity.
Official advisory · high-confidence parse· fetched 24 days ago·verify at source
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