CVE-2026-74383: nvme-pci: fix out-of-bounds access in nvme_setup_descriptor_pools

From: Greg Kroah-Hartman <[email protected]>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

nvme-pci: fix out-of-bounds access in nvme_setup_descriptor_pools

nvme_setup_descriptor_pools() indexes dev->descriptor_pools[] using the
numa_node forwarded from hctx->numa_node by its single caller,
nvme_init_hctx_common().  On a non-NUMA kernel hctx->numa_node is
NUMA_NO_NODE (-1).  Because the parameter was declared 'unsigned', the
value becomes UINT_MAX and the index walks off the array (sized to
nr_node_ids), faulting during nvme_alloc_ns() and leaving the namespace
without a /dev node.

Reproduces on any NVMe controller probed by a CONFIG_NUMA=n kernel:

  BUG: unable to handle page fault for address: ffff889101603d38
  RIP: 0010:nvme_init_hctx_common+0x5a/0x190 [nvme]
  Call Trace:
   nvme_init_hctx+0x10/0x20 [nvme]
   nvme_alloc_ns+0x9e/0xa10 [nvme_core]
   nvme_scan_ns+0x301/0x3b0 [nvme_core]
   nvme_scan_ns_async+0x23/0x30 [nvme_core]

Switch the parameter to int and fall back to node 0 when it is
NUMA_NO_NODE; node 0 is always present.

The Linux kernel CVE team has assigned CVE-2026-74383 to this issue.


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

	Issue introduced in 6.16 with commit d977506f8863807129d7a11f4057dfb1b38085ea and fixed in 6.18.40 with commit 3e8aed5edaeeb237f97255d711aac6b5843fc059
	Issue introduced in 6.16 with commit d977506f8863807129d7a11f4057dfb1b38085ea and fixed in 7.1.5 with commit fa9b6accd1ad7af6914b409c6b003c417724c299
	Issue introduced in 6.16 with commit d977506f8863807129d7a11f4057dfb1b38085ea and fixed in 7.2-rc1 with commit a192b8cfa447e1b3701a13434a31c392b2e7ed29

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-2026-74383
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/pci.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/3e8aed5edaeeb237f97255d711aac6b5843fc059
	https://git.kernel.org/stable/c/fa9b6accd1ad7af6914b409c6b003c417724c299
	https://git.kernel.org/stable/c/a192b8cfa447e1b3701a13434a31c392b2e7ed29