Bug 2395778 (CVE-2025-39820)

Summary: CVE-2025-39820 kernel: drm/msm/dpu: Add a null ptr check for dpu_encoder_needs_modeset
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-09-16 14:01:47 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/msm/dpu: Add a null ptr check for dpu_encoder_needs_modeset

The drm_atomic_get_new_connector_state() can return NULL if the
connector is not part of the atomic state. Add a check to prevent
a NULL pointer dereference.

This follows the same pattern used in dpu_encoder_update_topology()
within the same file, which checks for NULL before using conn_state.

Patchwork: https://patchwork.freedesktop.org/patch/665188/
Comment 1 Keith Grant 2025-09-16 16:13:43 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091615-CVE-2025-39820-50d7@gregkh/T