CVE-2024-27435

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The issue is related to a reconnection failure in the Linux kernel when using NVMe over RDMA. The problem occurs due to a potential ABBA deadlock caused by tag allocation. Specifically, the admin q reconnect fails forever when the remote target and network are okay. This happens because the tag is held by a keep alive request waiting inside admin q, and the only reserved tag is held by the keep alive command. As a result, the reconnect fails. The issue is caused by the allocation of tags, where fabric q shares the tag set with admin q. To fix this issue, it is suggested to keep two reserved tags for the admin queue.

Recommendations To resolve the issue, keep two reserved tags for the admin queue. This will prevent the reconnect failure caused by the ABBA deadlock due to tag allocation.