CVE-2025-39741: 
Linux Ubuntu vulnerability analysis and mitigation

A vulnerability has been identified in the Linux kernel's drm/xe/migrate component (CVE-2025-39741), discovered on September 11, 2025. The issue involves a potential overflow in the maximum copy size calculation when dealing with non-page aligned copies in the DRM subsystem (NVD).

The vulnerability occurs in the drm/xe/migrate component where non-page aligned copies require 4-byte aligned pitch. The size can approach the maximum of ~8M, causing the dimensions of the copy to exceed the S16MAX limit of the copy command. This results in an assertion failure: 'size / pitch <= ((s16)(((u16)~0U) >> 1))' in the emitcopy function at drivers/gpu/drm/xe/xe_migrate.c:673 (NVD).

The vulnerability can lead to system instability and potential denial of service conditions when processing certain graphics operations in the Linux kernel's DRM subsystem (NVD).

A fix has been implemented that accounts for the pitch when calculating the number of current bytes to copy. The patch has been cherry-picked from commit 8c2d61e0e916e077fda7e7b8e67f25ffe0f361fc (NVD).