CVE-2026-93104: RDMA/rvt: Return NULL after port allocation failure

CVE-2026-93104: RDMA/rvt: Return NULL after port allocation failure

[Greg Kroah-Hartman]

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

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

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

RDMA/rvt: Return NULL after port allocation failure

rvt_alloc_device() deallocates the IB device when its port array cannot
be allocated but then returns the pointer to the released allocation.
Callers treat any non-NULL value as valid and dereference it, resulting
in a use-after-free.

Return NULL immediately after deallocation so callers can propagate the
allocation failure.

The Linux kernel CVE team has assigned CVE-2026-93104 to this issue.


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

	Issue introduced in 4.6 with commit ff6acd69518e0a84bd9c9b7f1bd4313f7076db97 and fixed in 7.2.6 with commit b1e1b25723af44328524c7b54433e4bf0ab9930c
	Issue introduced in 4.6 with commit ff6acd69518e0a84bd9c9b7f1bd4313f7076db97 and fixed in 7.3-rc1 with commit 2982eaf3b9d2d953318c74cd6f1b7576ea6d7b1f

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-2026-93104
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/sw/rdmavt/vt.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/b1e1b25723af44328524c7b54433e4bf0ab9930c
	https://git.kernel.org/stable/c/2982eaf3b9d2d953318c74cd6f1b7576ea6d7b1f