CVE-2026-43294

/// Technical 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

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References