linux-cve-announce - CVE-2022-50874: RDMA/erdma: Fix refcount leak in erdma

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Message-ID: <2025123022-CVE-2022-50874-bd1d@gregkh>
Date: Tue, 30 Dec 2025 13:23:23 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50874: RDMA/erdma: Fix refcount leak in erdma_mmap

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

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

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

RDMA/erdma: Fix refcount leak in erdma_mmap

rdma_user_mmap_entry_get() take reference, we should release it when not
need anymore, add the missing rdma_user_mmap_entry_put() in the error
path to fix it.

The Linux kernel CVE team has assigned CVE-2022-50874 to this issue.


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

	Issue introduced in 6.0 with commit 155055771704f8cbb5c176a4309b7dc30a50450c and fixed in 6.1.16 with commit 8372207b009d6abdd60bb05624640bd86386599f
	Issue introduced in 6.0 with commit 155055771704f8cbb5c176a4309b7dc30a50450c and fixed in 6.2.3 with commit 410f0f46ffca4d0102470c1e0c747ecfece4204c
	Issue introduced in 6.0 with commit 155055771704f8cbb5c176a4309b7dc30a50450c and fixed in 6.3 with commit ee84146c05ad2316b9a7222d0ec4413e0bf30eeb

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-2022-50874
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/erdma/erdma_verbs.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/8372207b009d6abdd60bb05624640bd86386599f
	https://git.kernel.org/stable/c/410f0f46ffca4d0102470c1e0c747ecfece4204c
	https://git.kernel.org/stable/c/ee84146c05ad2316b9a7222d0ec4413e0bf30eeb