linux-cve-announce - CVE-2025-40031: tee: fix register_shm

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Message-ID: <2025102810-CVE-2025-40031-3ff1@gregkh>
Date: Tue, 28 Oct 2025 12:48:08 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40031: tee: fix register_shm_helper()

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

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

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

tee: fix register_shm_helper()

In register_shm_helper(), fix incorrect error handling for a call to
iov_iter_extract_pages(). A case is missing for when
iov_iter_extract_pages() only got some pages and return a number larger
than 0, but not the requested amount.

This fixes a possible NULL pointer dereference following a bad input from
ioctl(TEE_IOC_SHM_REGISTER) where parts of the buffer isn't mapped.

The Linux kernel CVE team has assigned CVE-2025-40031 to this issue.


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

	Issue introduced in 6.8 with commit 7bdee41575919773818e525ea19e54eb817770af and fixed in 6.12.53 with commit 9338093db954918558677a468d32e77041c65167
	Issue introduced in 6.8 with commit 7bdee41575919773818e525ea19e54eb817770af and fixed in 6.17.3 with commit 6a7874ab814ce12003c46a92f7afc9b035c8e8e9
	Issue introduced in 6.8 with commit 7bdee41575919773818e525ea19e54eb817770af and fixed in 6.18-rc1 with commit d5cf5b37064b1699d946e8b7ab4ac7d7d101814c

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-2025-40031
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/tee/tee_shm.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/9338093db954918558677a468d32e77041c65167
	https://git.kernel.org/stable/c/6a7874ab814ce12003c46a92f7afc9b035c8e8e9
	https://git.kernel.org/stable/c/d5cf5b37064b1699d946e8b7ab4ac7d7d101814c