CVE-2021-47046 drm/amd/display: Fix off by one in hdmi_14_process_transaction()
An off-by-one error in the Linux kernel's AMD display driver allows an out-of-bounds read, potentially exposing sensitive memory data.
- 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-2021-47046?
CVE-2021-47046 is a high-severity vulnerability in Linux kernel, published on 28 Feb 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/amd/display: Fix off by one in hdmi_14_process_transaction()
The hdcp_i2c_offsets[] array did not have an entry for HDCP_MESSAGE_ID_WRITE_CONTENT_STREAM_TYPE so it led to an off by one read overflow. I added an entry and copied the 0x0 value for the offset from similar code in drivers/gpu/drm/amd/display/modules/hdcp/hdcp_ddc.c.
I also declared several of these arrays as having HDCP_MESSAGE_ID_MAX entries. This doesn't change the code, but it's just a belt and suspenders approach to try future proof the code.
Weakness: CWE-193
Which versions are affected by CVE-2021-47046?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47046?
Apply the vendor's patch.
Is CVE-2021-47046 being exploited?
There is no known exploitation of CVE-2021-47046 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47046, GHSA-2v9v-6h75-597v, UBUNTU-CVE-2021-47046.