CVE-2024-50134

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

drm/vboxvideo: Replace fake VLA at end of vbva_mouse_pointer_shape with real VLA

Replace the fake VLA at end of the vbva_mouse_pointer_shape shape with

a real VLA to fix a "memcpy: detected field-spanning write error" warning:

[ 13.319813] memcpy: detected field-spanning write (size 16896) of single field "p->data" at drivers/gpu/drm/vboxvideo/hgsmi_base.c:154 (size 4)

[ 13.319841] WARNING: CPU: 0 PID: 1105 at drivers/gpu/drm/vboxvideo/hgsmi_base.c:154 hgsmi_update_pointer_shape+0x192/0x1c0 [vboxvideo]

[ 13.320038] Call Trace:

[ 13.320173] hgsmi_update_pointer_shape [vboxvideo]

[ 13.320184] vbox_cursor_atomic_update [vboxvideo]

Note as mentioned in the added comment it seems the original length

calculation for the allocated and send hgsmi buffer is 4 bytes too large.

Changing this is not the goal of this patch, so this behavior is kept.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References