CVE-2024-50096 nouveau/dmem: Fix vulnerability in migrate_to_ram upon copy error
A flaw in the Linux kernel nouveau driver may return dirty memory pages to users upon copy errors, potentially exposing sensitive 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-2024-50096?
CVE-2024-50096 is a high-severity 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:
nouveau/dmem: Fix vulnerability in migrate_to_ram upon copy error
The `nouveau_dmem_copy_one` function ensures that the copy push command is sent to the device firmware but does not track whether it was executed successfully.
In the case of a copy error (e.g., firmware or hardware failure), the copy push command will be sent via the firmware channel, and `nouveau_dmem_copy_one` will likely report success, leading to the `migrate_to_ram` function returning a dirty HIGH_USER page to the user.
This can result in a security vulnerability, as a HIGH_USER page that may contain sensitive or corrupted data could be returned to the user.
To prevent this vulnerability, we allocate a zero page. Thus, in case of an error, a non-dirty (zero) page will be returned to the user.
Which versions are affected by CVE-2024-50096?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-50096?
Apply the vendor's patch.
Is CVE-2024-50096 being exploited?
There is no known exploitation of CVE-2024-50096 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-52564, BELL-CVE-2024-50096, DEBIAN-CVE-2024-50096, GHSA-9ffw-88h4-2w7x, UBUNTU-CVE-2024-50096.