CVE-2022-48771 drm/vmwgfx: Fix stale file descriptors on failed usercopy
A use-after-free vulnerability in the Linux kernel's vmwgfx driver allows local attackers to execute arbitrary code or escalate privileges via stale file descriptors.
- 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-2022-48771?
CVE-2022-48771 is a high-severity use after free vulnerability in Linux kernel, published on 20 Jun 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/vmwgfx: Fix stale file descriptors on failed usercopy
A failing usercopy of the fence_rep object will lead to a stale entry in the file descriptor table as put_unused_fd() won't release it. This enables userland to refer to a dangling 'file' object through that still valid file descriptor, leading to all kinds of use-after-free exploitation scenarios.
Fix this by deferring the call to fd_install() until after the usercopy has succeeded.
Weakness: CWE-416
Which versions are affected by CVE-2022-48771?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-48771?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2022-48771 being exploited?
There is no known exploitation of CVE-2022-48771 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-48771, GHSA-j2qm-vfcf-p3gj, ROOT-OS-UBUNTU-2204-CVE-2022-48771, UBUNTU-CVE-2022-48771.