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redhatcveRedhat.comRH:CVE-2024-27435
HistoryMay 17, 2024 - 11:10 p.m.

CVE-2024-27435

2024-05-1723:10:32
redhat.com
access.redhat.com
4
linux kernel
vulnerability
cve-2024-27435
resolved
reconnection
fail
reserved tag allocation
nvme
rdma
issue
production environment
abba deadlock
tag allocation
keep alive request
quiesced
fabric queue
connect command
mitigation
security advisory

6.8 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

15.5%

In the Linux kernel, the following vulnerability has been resolved: nvme: fix reconnection fail due to reserved tag allocation We found a issue on production environment while using NVMe over RDMA, admin_q reconnect failed forever while remote target and network is ok. After dig into it, we found it may caused by a ABBA deadlock due to tag allocation. In my case, the tag was hold by a keep alive request waiting inside admin_q, as we quiesced admin_q while reset ctrl, so the request maked as idle and will not process before reset success. As fabric_q shares tagset with admin_q, while reconnect remote target, we need a tag for connect command, but the only one reserved tag was held by keep alive command which waiting inside admin_q. As a result, we failed to reconnect admin_q forever. In order to fix this issue, I think we should keep two reserved tags for admin queue.

6.8 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

15.5%