CVE-2025-39807

drm/mediatek: Add error handling for old state CRTC in atomic_disable

State: Published
Severity: 5.5 Medium
Published: Sep 16, 2025
Updated: May 23, 2026
Reserved: Apr 16, 2025

Description

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

drm/mediatek: Add error handling for old state CRTC in atomic_disable

Introduce error handling to address an issue where, after a hotplug event, the cursor continues to update. This situation can lead to a kernel panic due to accessing the NULL `old_state->crtc`.

E,g. Unable to handle kernel NULL pointer dereference at virtual address Call trace: mtk_crtc_plane_disable+0x24/0x140 mtk_plane_atomic_update+0x8c/0xa8 drm_atomic_helper_commit_planes+0x114/0x2c8 drm_atomic_helper_commit_tail_rpm+0x4c/0x158 commit_tail+0xa0/0x168 drm_atomic_helper_commit+0x110/0x120 drm_atomic_commit+0x8c/0xe0 drm_atomic_helper_update_plane+0xd4/0x128 __setplane_atomic+0xcc/0x110 drm_mode_cursor_common+0x250/0x440 drm_mode_cursor_ioctl+0x44/0x70 drm_ioctl+0x264/0x5d8 __arm64_sys_ioctl+0xd8/0x510 invoke_syscall+0x6c/0xe0 do_el0_svc+0x68/0xe8 el0_svc+0x34/0x60 el0t_64_sync_handler+0x1c/0xf8 el0t_64_sync+0x180/0x188

Adding NULL pointer checks to ensure stability by preventing operations on an invalid CRTC state.

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-476 NULL Pointer Dereference

Affected Products

Product	Versions
LinuxLinux	40b5b4ba8ed87c0bfb6268c10589777652ebde4c to before 7d5cc22efa44e0fe321ce195c71c3d7da211fbb2Affected d208261e9f7c66960587b10473081dc1cecbe50b to before 9a94e9d8b50bcfe89693bc899a54d3866d86e973Affected d208261e9f7c66960587b10473081dc1cecbe50b to before 0c6b24d70da21201ed009a2aca740d2dfddc7ab5Affected a9c482689051ca96f4a4630fe49fd6919694caaaAffected 6.12.40 to before 6.12.45Affected 6.15.8 to before 6.16Affected
LinuxLinux	6.16Affected before 6.16Not affected 6.12.45 through 6.12.Not affected 6.16.5 through 6.16.Not affected 6.17 and laterNot affected

Product

Versions

LinuxLinux

40b5b4ba8ed87c0bfb6268c10589777652ebde4c to before 7d5cc22efa44e0fe321ce195c71c3d7da211fbb2Affected
d208261e9f7c66960587b10473081dc1cecbe50b to before 9a94e9d8b50bcfe89693bc899a54d3866d86e973Affected
d208261e9f7c66960587b10473081dc1cecbe50b to before 0c6b24d70da21201ed009a2aca740d2dfddc7ab5Affected
a9c482689051ca96f4a4630fe49fd6919694caaaAffected
6.12.40 to before 6.12.45Affected
6.15.8 to before 6.16Affected

LinuxLinux

6.16Affected
before 6.16Not affected
6.12.45 through 6.12.*Not affected
6.16.5 through 6.16.*Not affected
6.17 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.