linux-cve-announce - CVE-2023-53251: wifi: iwlwifi: pcie: fix NULL pointer dereference in iwl_pcie_irq_rx_msix

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Message-ID: <2025091502-CVE-2023-53251-8d43@gregkh>
Date: Mon, 15 Sep 2025 16:46:26 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53251: wifi: iwlwifi: pcie: fix NULL pointer dereference in iwl_pcie_irq_rx_msix_handler()

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

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

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

wifi: iwlwifi: pcie: fix NULL pointer dereference in iwl_pcie_irq_rx_msix_handler()

rxq can be NULL only when trans_pcie->rxq is NULL and entry->entry
is zero. For the case when entry->entry is not equal to 0, rxq
won't be NULL even if trans_pcie->rxq is NULL. Modify checker to
check for trans_pcie->rxq.

The Linux kernel CVE team has assigned CVE-2023-53251 to this issue.


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

	Issue introduced in 5.12 with commit abc599efa67bb4138536360e07d677052b19e392 and fixed in 5.15.121 with commit 3b9de981fe7f1c6e07c7b852421ad69be3d4b6c2
	Issue introduced in 5.12 with commit abc599efa67bb4138536360e07d677052b19e392 and fixed in 6.1.39 with commit 2d690495eb2766d58e25c83676f422219c4fcf18
	Issue introduced in 5.12 with commit abc599efa67bb4138536360e07d677052b19e392 and fixed in 6.3.13 with commit 390e44efcf4d390b5053ad112553155d2d097c73
	Issue introduced in 5.12 with commit abc599efa67bb4138536360e07d677052b19e392 and fixed in 6.4.4 with commit f71d0fc407dd028416bec002ddcc62f5acb0346a
	Issue introduced in 5.12 with commit abc599efa67bb4138536360e07d677052b19e392 and fixed in 6.5 with commit 1902f1953b8ba100ee8705cb8a6f1a9795550eca

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-2023-53251
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/net/wireless/intel/iwlwifi/pcie/rx.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/3b9de981fe7f1c6e07c7b852421ad69be3d4b6c2
	https://git.kernel.org/stable/c/2d690495eb2766d58e25c83676f422219c4fcf18
	https://git.kernel.org/stable/c/390e44efcf4d390b5053ad112553155d2d097c73
	https://git.kernel.org/stable/c/f71d0fc407dd028416bec002ddcc62f5acb0346a
	https://git.kernel.org/stable/c/1902f1953b8ba100ee8705cb8a6f1a9795550eca