CVE-2021-47420 drm/amdkfd: fix a potential ttm->sg memory leak
A memory leak in the Linux kernel's AMD GPU driver allows attackers to exhaust system memory, causing a denial of service.
- 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-2021-47420?
CVE-2021-47420 is a medium-severity denial of service vulnerability in Linux kernel, published on 21 May 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/amdkfd: fix a potential ttm->sg memory leak
Memory is allocated for ttm->sg by kmalloc in kfd_mem_dmamap_userptr, but isn't freed by kfree in kfd_mem_dmaunmap_userptr. Free it!
Weakness: CWE-401
Which versions are affected by CVE-2021-47420?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47420?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-47420 being exploited?
There is no known exploitation of CVE-2021-47420 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47420, GHSA-gx2j-3fvm-rqj3, UBUNTU-CVE-2021-47420.