CVE-2026-90227 nvme/ioctl: check SUBMIT_IO with nvme_cmd_allowed()
Unprivileged users can bypass write restrictions on NVMe devices due to missing authorization checks in the ioctl handler.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-90227?
CVE-2026-90227 is a high-severity missing authorization vulnerability in Linux, published on 17 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:
nvme/ioctl: check SUBMIT_IO with nvme_cmd_allowed()
Unlike IO_CMD / IO64_CMD, NVME_IOCTL_SUBMIT_IO never calls nvme_cmd_allowed(). Unprivileged callers can thus issue I/O on a partition device or write through a read-only file descriptor.
Pass flags and open_for_write through and reject disallowed commands with -EACCES.
Which versions are affected by CVE-2026-90227?
How do I fix CVE-2026-90227?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-90227 being exploited?
There is no known exploitation of CVE-2026-90227 in the wild and no public exploit code.
Sources
Also known as AZL-101963, BELL-CVE-2026-90227, DEBIAN-CVE-2026-90227, GHSA-g7gf-5v23-7wc5, UBUNTU-CVE-2026-90227.