CVE-2026-93103: RDMA/hfi1: Preserve unit 0 on allocation failure

CVE-2026-93103: RDMA/hfi1: Preserve unit 0 on allocation failure

[Greg Kroah-Hartman]

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

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

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

RDMA/hfi1: Preserve unit 0 on allocation failure

hfi1_free_devdata() assumes that the device was inserted into the unit
table and unconditionally erases dd->unit. If xa_alloc_irq() fails, the
zero-initialized unit remains zero, so full cleanup can remove an
unrelated device from index 0.

Release only the rdmavt allocation and return immediately while the unit
table has not acquired the device.

The Linux kernel CVE team has assigned CVE-2026-93103 to this issue.


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

	Issue introduced in 5.2 with commit 03b92789e5cfdac66805c1a98f1ec67336199d56 and fixed in 5.10.270 with commit 852637d3ee56aed8ea3ee8948eda21eca406c051
	Issue introduced in 5.2 with commit 03b92789e5cfdac66805c1a98f1ec67336199d56 and fixed in 5.15.221 with commit 3d0e5252b8d0345ef494763ca31e3ddd666e02cb
	Issue introduced in 5.2 with commit 03b92789e5cfdac66805c1a98f1ec67336199d56 and fixed in 6.1.188 with commit 0feb29d434e6cc0ebefec4f77be014c85ad751b0
	Issue introduced in 5.2 with commit 03b92789e5cfdac66805c1a98f1ec67336199d56 and fixed in 6.6.157 with commit 3f1e196eb66b8cd3882e373794d6cea46f150a20
	Issue introduced in 5.2 with commit 03b92789e5cfdac66805c1a98f1ec67336199d56 and fixed in 6.12.110 with commit 4ff9d58d34758e9633078b37e8d5289b513ff80e
	Issue introduced in 5.2 with commit 03b92789e5cfdac66805c1a98f1ec67336199d56 and fixed in 6.18.52 with commit fd4d3ad5f244a867166d1e2da7ece3d82878ec81
	Issue introduced in 5.2 with commit 03b92789e5cfdac66805c1a98f1ec67336199d56 and fixed in 7.2.6 with commit 4204f5c0312ba136181a6e148ffa0bfaf95a4cc1
	Issue introduced in 5.2 with commit 03b92789e5cfdac66805c1a98f1ec67336199d56 and fixed in 7.3-rc1 with commit 2e3809ad8911f5d5581b3f046bd628417bface76

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-2026-93103
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/infiniband/hw/hfi1/init.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/852637d3ee56aed8ea3ee8948eda21eca406c051
	https://git.kernel.org/stable/c/3d0e5252b8d0345ef494763ca31e3ddd666e02cb
	https://git.kernel.org/stable/c/0feb29d434e6cc0ebefec4f77be014c85ad751b0
	https://git.kernel.org/stable/c/3f1e196eb66b8cd3882e373794d6cea46f150a20
	https://git.kernel.org/stable/c/4ff9d58d34758e9633078b37e8d5289b513ff80e
	https://git.kernel.org/stable/c/fd4d3ad5f244a867166d1e2da7ece3d82878ec81
	https://git.kernel.org/stable/c/4204f5c0312ba136181a6e148ffa0bfaf95a4cc1
	https://git.kernel.org/stable/c/2e3809ad8911f5d5581b3f046bd628417bface76