CVE-2026-90227: nvme/ioctl: check SUBMIT_IO with nvme_cmd_allowed()

CVE-2026-90227: nvme/ioctl: check SUBMIT_IO with nvme_cmd_allowed()

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

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.

The Linux kernel CVE team has assigned CVE-2026-90227 to this issue.


Affected and fixed versions
===========================

	Fixed in 6.6.157 with commit c35cd98eed1a863e8dd51073953563cd8c907f68
	Fixed in 6.12.110 with commit 95b0591d51dbf9e618d7845883d535e88ad7c8af
	Fixed in 6.18.52 with commit 736b7c6adc7a65c4411beff197b6a634f7a6ca27
	Fixed in 7.2.6 with commit b116e9dae433ff631f94c36c61a7a78fe400ed1e
	Fixed in 7.3-rc1 with commit b53d495c7f0db46b6748b5ade48371a10dd5d3bc

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-90227
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/nvme/host/ioctl.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/c35cd98eed1a863e8dd51073953563cd8c907f68
	https://git.kernel.org/stable/c/95b0591d51dbf9e618d7845883d535e88ad7c8af
	https://git.kernel.org/stable/c/736b7c6adc7a65c4411beff197b6a634f7a6ca27
	https://git.kernel.org/stable/c/b116e9dae433ff631f94c36c61a7a78fe400ed1e
	https://git.kernel.org/stable/c/b53d495c7f0db46b6748b5ade48371a10dd5d3bc