CVE-2024-27435 nvme: fix reconnection fail due to reserved tag allocation
A deadlock in the Linux kernel NVMe driver prevents reconnection, causing a denial of service for NVMe over RDMA connections.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-27435?
CVE-2024-27435 is a high-severity vulnerability in Linux kernel, published on 17 May 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-667
Which versions are affected by CVE-2024-27435?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-27435?
Apply the vendor's patch.
Is CVE-2024-27435 being exploited?
There is no known exploitation of CVE-2024-27435 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-67581, BELL-CVE-2024-27435, DEBIAN-CVE-2024-27435, GHSA-5mwv-x2qc-g5cj, ROOT-OS-UBUNTU-2204-CVE-2024-27435, UBUNTU-CVE-2024-27435.