CVE-2025-68184: 
Linux Kernel vulnerability analysis and mitigation

CVE-2025-68184 is a vulnerability in the Linux kernel's drm/mediatek DRM driver related to broken AFBC (Arm Frame Buffer Compression) support introduced by commit c410fa9b07c3 ("drm/mediatek: Add AFBC support to Mediatek DRM driver"). The flaw causes vblank timeouts and garbled rendering on MediaTek MT8188 (Genio 700 EVK) platforms when AFBC is active, which became the default behavior starting with Mesa v25.0. The fix disables AFBC support in the Mediatek DRM driver to restore stable display operation. It was published on December 16, 2025, and has an EPSS score of 0.018% (very low), indicating minimal exploitation likelihood (CVE Record).

The root cause is an incorrect or incomplete implementation of AFBC (32x8/split/sparse modifier) support in the Mediatek DRM driver, introduced in commit c410fa9b07c3. When Mesa v25.0+ enables AFBC by default, the kernel driver fails to handle the compressed framebuffer format correctly, resulting in vblank wait timeouts (drm_atomic_helper_wait_for_vblanks) and corrupted display output. The issue is classified as a functional/stability defect in the DRM subsystem (CWE-703: Improper Check or Handling of Exceptional Conditions) rather than a traditional security vulnerability. The fix reverts or disables the AFBC modifier support in the driver until a correct implementation is available (CVE Record).

The primary impact is a denial-of-service condition on the display subsystem of affected MediaTek MT8188-based devices: the system experiences continuous vblank timeouts and garbled/corrupted rendering output, effectively making the graphical interface unusable. This is a local availability impact affecting the display hardware; there is no known confidentiality or integrity impact, and no evidence of lateral movement potential. The issue is limited to systems running the affected kernel with Mesa v25.0 or later on MediaTek MT8188 hardware (CVE Record).

The fix is to apply the upstream Linux kernel patch that disables AFBC support in the Mediatek DRM driver (referenced commits: 0eaa0a3dfe218c4cf1a0782ccbbc9e3931718f17, 9882a40640036d5bbc590426a78981526d4f2345, 72223700b620885d556a4c52a63f5294316176c6, df1ad5de2197ea1b527d13ae7b699e9ee7d724d4). Users on affected MediaTek MT8188 platforms should update to a kernel version that includes this fix. As a temporary workaround, downgrading Mesa to a version prior to v25.0 (which does not enable AFBC by default) will prevent the issue from manifesting (CVE Record).