CVE-2026-80813 nvmet: fix NULL pointer dereference in nvmet_execute_identify_nslist()
A remote attacker can crash the Linux kernel by sending a specific NVMe Identify command, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80813?
CVE-2026-80813 is a vulnerability in Linux, published on 4 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
nvmet: fix NULL pointer dereference in nvmet_execute_identify_nslist()
When a host issues an Identify command with CNS 07h (Active Namespace ID List for a specific I/O Command Set), nvmet_execute_identify_nslist() is called with match_css set. The command-set filter dereferences req->ns, but this handler never calls nvmet_req_find_ns(), so req->ns is always NULL (nvmet_req_init() resets it to NULL). As soon as an enabled namespace with an NSID greater than the requested value exists, req->ns->csi dereferences a NULL pointer and oopses.
Besides the crash, the comparison is logically wrong: to filter the list by command set it must test the command set of the namespace being iterated, not a single fixed value. Use the loop variable ns->csi.
Which versions are affected by CVE-2026-80813?
How do I fix CVE-2026-80813?
Apply the vendor's patch.
Is CVE-2026-80813 being exploited?
There is no known exploitation of CVE-2026-80813 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80813, DEBIAN-CVE-2026-80813, GHSA-rf7w-4fpm-954r, UBUNTU-CVE-2026-80813.