From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-cve-announce@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@kernel.org>
Subject: CVE-2026-43294: drm: renesas: rz-du: mipi_dsi: fix kernel panic when rebooting for some panels
Date: Fri, 8 May 2026 15:11:59 +0200 [thread overview]
Message-ID: <2026050854-CVE-2026-43294-8714@gregkh> (raw)
From: Greg Kroah-Hartman <gregkh@kernel.org>
Description
===========
In the Linux kernel, the following vulnerability has been resolved:
drm: renesas: rz-du: mipi_dsi: fix kernel panic when rebooting for some panels
Since commit 56de5e305d4b ("clk: renesas: r9a07g044: Add MSTOP for RZ/G2L")
we may get the following kernel panic, for some panels, when rebooting:
systemd-shutdown[1]: Rebooting.
Call trace:
...
do_serror+0x28/0x68
el1h_64_error_handler+0x34/0x50
el1h_64_error+0x6c/0x70
rzg2l_mipi_dsi_host_transfer+0x114/0x458 (P)
mipi_dsi_device_transfer+0x44/0x58
mipi_dsi_dcs_set_display_off_multi+0x9c/0xc4
ili9881c_unprepare+0x38/0x88
drm_panel_unprepare+0xbc/0x108
This happens for panels that need to send MIPI-DSI commands in their
unprepare() callback. Since the MIPI-DSI interface is stopped at that
point, rzg2l_mipi_dsi_host_transfer() triggers the kernel panic.
Fix by moving rzg2l_mipi_dsi_stop() to new callback function
rzg2l_mipi_dsi_atomic_post_disable().
With this change we now have the correct power-down/stop sequence:
systemd-shutdown[1]: Rebooting.
rzg2l-mipi-dsi 10850000.dsi: rzg2l_mipi_dsi_atomic_disable(): entry
ili9881c-dsi 10850000.dsi.0: ili9881c_unprepare(): entry
rzg2l-mipi-dsi 10850000.dsi: rzg2l_mipi_dsi_atomic_post_disable(): entry
reboot: Restarting system
The Linux kernel CVE team has assigned CVE-2026-43294 to this issue.
Affected and fixed versions
===========================
Fixed in 6.18.16 with commit 79f42487ed60d0d5ffce97c3bb98f80c3d17735a
Fixed in 6.19.6 with commit 41cda667ffc5074c56279c632b0c20024da6ecdd
Fixed in 7.0 with commit 64aa8b3a60a825134f7d866adf05c024bbe0c24c
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-2026-43294
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/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.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/79f42487ed60d0d5ffce97c3bb98f80c3d17735a
https://git.kernel.org/stable/c/41cda667ffc5074c56279c632b0c20024da6ecdd
https://git.kernel.org/stable/c/64aa8b3a60a825134f7d866adf05c024bbe0c24c
reply other threads:[~2026-05-08 13:14 UTC|newest]
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