linux-cve-announce - CVE-2022-49988: binder_alloc: add missing mmap

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Message-ID: <2025061823-CVE-2022-49988-d597@gregkh>
Date: Wed, 18 Jun 2025 13:00:53 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49988: binder_alloc: add missing mmap_lock calls when using the VMA

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

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

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

binder_alloc: add missing mmap_lock calls when using the VMA

Take the mmap_read_lock() when using the VMA in binder_alloc_print_pages()
and when checking for a VMA in binder_alloc_new_buf_locked().

It is worth noting binder_alloc_new_buf_locked() drops the VMA read lock
after it verifies a VMA exists, but may be taken again deeper in the call
stack, if necessary.

The Linux kernel CVE team has assigned CVE-2022-49988 to this issue.


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

	Issue introduced in 5.15.61 with commit 622ef885a89ad04cfb76ee478fb44f051125d1f1 and fixed in 5.15.64 with commit 577d9c05cc48c5242bcf719c06a5baf3105473ad
	Issue introduced in 5.19.2 with commit 1ec3f76a436d750fd5023caec5da0494fc2870d2 and fixed in 5.19.6 with commit 7b0163c1b07b7ff1717aa975821c40df98786ddc
	Issue introduced in 5.18.18 with commit 925e6b6f82c9c80ab3c17acbde8d16f349da7d26

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-2022-49988
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/android/binder_alloc.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/577d9c05cc48c5242bcf719c06a5baf3105473ad
	https://git.kernel.org/stable/c/7b0163c1b07b7ff1717aa975821c40df98786ddc
	https://git.kernel.org/stable/c/44e602b4e52f70f04620bbbf4fe46ecb40170bde