CVE-2025-21697: 
Linux Kernel vulnerability analysis and mitigation

CVE-2025-21697 affects the Linux kernel's DRM (Direct Rendering Manager) V3D driver. The vulnerability was discovered on February 12, 2025, and involves a failure to properly handle job pointer cleanup after job completion. This issue affects Linux kernel versions from 4.19 up to versions before 5.4.290, 5.10.234, 5.15.177, and 6.1.127 (NVD).

The vulnerability exists in the V3D driver's interrupt handling code where job pointers are not properly set to NULL after job completion. When a job completes, the corresponding pointer in the device should be set to NULL, but failing to do so triggers a warning when unloading the driver as it appears the job is still active. The issue has been assigned a CVSS v3.1 base score of 5.5 (Medium) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (NVD).

The primary impact of this vulnerability is potential system instability when unloading the V3D driver. The issue can trigger false warnings about active jobs, which may affect system operations and driver functionality. The CVSS score indicates that while the vulnerability requires local access and has no impact on confidentiality or integrity, it can have a high impact on availability (NVD).

The vulnerability has been patched by ensuring job pointers are set to NULL after job completion. The fix involves adding NULL assignments after completing bin, render, CSD, and TFU jobs. The patch has been applied to the Linux kernel and is being distributed through various Linux distributions' update channels (Kernel Git).