CVE-2024-27435

CVE-2024-27435 is a Linux kernel vulnerability in the NVMe over RDMA implementation, where a reconnection failure occurs due to a deadlock caused by reserved tag allocation. The issue arises when the admin queue is quiesced while resetting the controller, causing a keep-alive request to hold the only reserved tag. As the admin queue and fabric queue share this tagset, the reconnection fails because no available tags are left for the connection command.

This vulnerability is rated as Moderate impact for Red Hat Enterprise Linux because exploitation requires an established NVMe over Fabrics connection and leads to a denial of service rather than code execution or privilege escalation. The condition only manifests during network target reconnections or controller reset events where queued heartbeat requests consume all available reserved command slots, preventing subsequent reconnection commands from completing. Standard enterprise deployments not utilizing NVMe fabric targets are unaffected by this issue.

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 for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.