linux-cve-announce - CVE-2025-21998: firmware: qcom: uefisecapp: fix efivars registration race

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Message-ID: <2025040348-CVE-2025-21998-b57d@gregkh>
Date: Thu,  3 Apr 2025 08:17:50 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21998: firmware: qcom: uefisecapp: fix efivars registration race

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

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

firmware: qcom: uefisecapp: fix efivars registration race

Since the conversion to using the TZ allocator, the efivars service is
registered before the memory pool has been allocated, something which
can lead to a NULL-pointer dereference in case of a racing EFI variable
access.

Make sure that all resources have been set up before registering the
efivars.

The Linux kernel CVE team has assigned CVE-2025-21998 to this issue.


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

	Issue introduced in 6.11 with commit 6612103ec35af6058bb85ab24dae28e119b3c055 and fixed in 6.12.21 with commit c4e37b381a7a243c298a4858fc0a5a74e737c79a
	Issue introduced in 6.11 with commit 6612103ec35af6058bb85ab24dae28e119b3c055 and fixed in 6.13.9 with commit f15a2b96a0e41c426c63a932d0e63cde7b9784aa
	Issue introduced in 6.11 with commit 6612103ec35af6058bb85ab24dae28e119b3c055 and fixed in 6.14 with commit da8d493a80993972c427002684d0742560f3be4a

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-2025-21998
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/firmware/qcom/qcom_qseecom_uefisecapp.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/c4e37b381a7a243c298a4858fc0a5a74e737c79a
	https://git.kernel.org/stable/c/f15a2b96a0e41c426c63a932d0e63cde7b9784aa
	https://git.kernel.org/stable/c/da8d493a80993972c427002684d0742560f3be4a