CVE-2021-47087 tee: optee: Fix incorrect page free bug
Incorrect page freeing in the Linux kernel OP-TEE driver allows arbitrary memory corruption, potentially leading to code execution or privilege escalation.
- 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-2021-47087?
CVE-2021-47087 is a high-severity memory corruption vulnerability in Linux kernel, published on 4 Mar 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:
tee: optee: Fix incorrect page free bug
Pointer to the allocated pages (struct page *page) has already progressed towards the end of allocation. It is incorrect to perform __free_pages(page, order) using this pointer as we would free any arbitrary pages. Fix this by stop modifying the page pointer.
Weakness: CWE-763
Which versions are affected by CVE-2021-47087?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47087?
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-2021-47087 being exploited?
There is no known exploitation of CVE-2021-47087 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47087, GHSA-3mhq-jqrv-fc88, UBUNTU-CVE-2021-47087.