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Linux Kernel CVE-2026-43294

| EUVDEUVD-2026-28564 MEDIUM
2026-05-08 Linux GHSA-hx9m-6f9p-cjmr
Information Disclosure Linux Red Hat Suse
5.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SUSE
MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

5
Analysis Generated
May 14, 2026 - 22:06 vuln.today
CVSS changed
May 14, 2026 - 19:52 NVD
5.5 (MEDIUM)
Patch available
May 08, 2026 - 14:02 EUVD
CVE Published
May 08, 2026 - 13:11 nvd
MEDIUM 5.5
CVE Published
May 08, 2026 - 13:11 nvd
UNKNOWN (no severity yet)

DescriptionCVE.org

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

AnalysisAI

Kernel panic occurs in the Renesas RZ/G2L MIPI DSI driver during system reboot when display panels attempt to send DSI commands in their unprepare callback, due to incorrect sequencing of driver shutdown. The vulnerability affects Linux kernel versions from commit 56de5e305d4b onwards on ARM64 systems running RZ/G2L platforms with specific panel types, allowing local users with standard privileges to trigger a denial of service by initiating a reboot.

Technical ContextAI

The vulnerability resides in the Renesas RZ/G2L MIPI DSI host driver (drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c). MIPI DSI (Mobile Industry Processor Interface Display Serial Interface) is a standard protocol for communication between application processors and display panels. The bug occurs because the rzg2l_mipi_dsi_stop() function was being called before the drm_panel_unprepare() callback, which for certain panels (such as ILI9881C) requires sending DSI commands to properly power down. When these commands are sent to a stopped interface, the hardware raises an SError exception, causing a kernel panic. The fix implements the proper DRM callback sequence by moving rzg2l_mipi_dsi_stop() to a new rzg2l_mipi_dsi_atomic_post_disable() callback, ensuring the DSI interface remains active during the unprepare phase and is only stopped afterward.

RemediationAI

Update to a patched Linux kernel version: 6.18.16, 6.19.6, 7.0 or later. Apply one of the upstream commits 79f42487ed60d0d5ffce97c3bb98f80c3d17735a, 41cda667ffc5074c56279c632b0c20024da6ecdd, or 64aa8b3a60a825134f7d866adf05c024bbe0c24c from git.kernel.org/stable. For distributions not yet carrying the fix, apply the patch directly to the rzg2l_mipi_dsi.c driver file to implement the rzg2l_mipi_dsi_atomic_post_disable() callback and move rzg2l_mipi_dsi_stop() invocation to that new callback instead of the atomic_disable phase. No workarounds are available short of patching; the issue cannot be mitigated through configuration or runtime settings. Affected systems should prioritize upgrading to prevent kernel panics during system reboot sequences.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed

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CVE-2026-43294 vulnerability details – vuln.today
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