CVE-2026-43294 drm: renesas: rz-du: mipi_dsi: fix kernel panic when rebooting for some panels
A kernel panic occurs during system reboot when specific MIPI-DSI panels are used, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-43294?
CVE-2026-43294 is a medium-severity denial of service vulnerability in Linux kernel, published on 8 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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
Which versions are affected by CVE-2026-43294?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43294?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-43294 being exploited?
There is no known exploitation of CVE-2026-43294 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-86187, BELL-CVE-2026-43294, DEBIAN-CVE-2026-43294, GHSA-hx9m-6f9p-cjmr, ROOT-OS-DEBIAN-13-CVE-2026-43294, ROOT-OS-UBUNTU-2204-CVE-2026-43294 and 2 more.