CVE-2026-68425

kernel: IB/mad: Drop unmatched RMPP responses before reassembly

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · August 10, 2026

Updated · August 31, 2026

Description

A flaw was found in the Linux kernel's InfiniBand (IB) Management Datagram (mad) component. A remote attacker could exploit this vulnerability by sending unsolicited Reliable Multicast Packet Protocol (RMPP) responses. This could lead to the kernel allocating or extending RMPP receive state for these unmatched responses, potentially causing resource exhaustion and a denial of service.

Statement

This issue affects InfiniBand RMPP in the MAD layer. Unmatched RMPP responses start reassembly before matching to an outstanding send, allowing remote injection of reassembly state. Systems without InfiniBand/RDMA are not affected.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-179 · Incorrect Behavior Order: Early Validation