CVE-2025-39807

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/mediatek: Add error handling for old state CRTC in atomic_disable<br /> <br /> Introduce error handling to address an issue where, after a hotplug<br /> event, the cursor continues to update. This situation can lead to a<br /> kernel panic due to accessing the NULL `old_state-&gt;crtc`.<br /> <br /> E,g.<br /> Unable to handle kernel NULL pointer dereference at virtual address<br /> Call trace:<br /> mtk_crtc_plane_disable+0x24/0x140<br /> mtk_plane_atomic_update+0x8c/0xa8<br /> drm_atomic_helper_commit_planes+0x114/0x2c8<br /> drm_atomic_helper_commit_tail_rpm+0x4c/0x158<br /> commit_tail+0xa0/0x168<br /> drm_atomic_helper_commit+0x110/0x120<br /> drm_atomic_commit+0x8c/0xe0<br /> drm_atomic_helper_update_plane+0xd4/0x128<br /> __setplane_atomic+0xcc/0x110<br /> drm_mode_cursor_common+0x250/0x440<br /> drm_mode_cursor_ioctl+0x44/0x70<br /> drm_ioctl+0x264/0x5d8<br /> __arm64_sys_ioctl+0xd8/0x510<br /> invoke_syscall+0x6c/0xe0<br /> do_el0_svc+0x68/0xe8<br /> el0_svc+0x34/0x60<br /> el0t_64_sync_handler+0x1c/0xf8<br /> el0t_64_sync+0x180/0x188<br /> <br /> Adding NULL pointer checks to ensure stability by preventing operations<br /> on an invalid CRTC state.