CVE-2024-50134 drm/vboxvideo: Replace fake VLA at end of vbva_mouse_pointer_shape with real VLA
A memory corruption issue in the vboxvideo driver causes a kernel warning and potential denial of service due to incorrect variable length array handling.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-50134?
CVE-2024-50134 is a medium-severity memory corruption vulnerability in Linux kernel, published on 5 Nov 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2024-50134?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-50134?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2024-50134 being exploited?
There is no known exploitation of CVE-2024-50134 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-52432, AZL-52437, BELL-CVE-2024-50134, DEBIAN-CVE-2024-50134, GHSA-jqqc-7468-4f66, UBUNTU-CVE-2024-50134.