GSD-2021-1002172 userfaultfd: fix a race between writeprotect and exit_mmap()
A race condition in the Linux kernel userfaultfd subsystem allows local attackers to potentially escalate privileges or cause 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
- None listed
What is GSD-2021-1002172?
GSD-2021-1002172 is a vulnerability in Kernel, published on 14 Nov 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
userfaultfd: fix a race between writeprotect and exit_mmap()
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.15 by commit cb185d5f1ebf900f4ae3bf84cee212e6dd035aca, it was introduced in version v5.7 by commit 63b2d4174c4ad1f40b48d7138e71bcb564c1fe03. For more details please see the references link.
Which versions are affected by GSD-2021-1002172?
1 open source package ship an affected version, including Kernel.
| Package | Affected | Fixed in |
|---|---|---|
Kernel Linux | All versions | None |
How do I fix GSD-2021-1002172?
No fix has been published for GSD-2021-1002172 yet. Limit exposure of the affected software until one is available.
Is GSD-2021-1002172 being exploited?
There is no known exploitation of GSD-2021-1002172 in the wild and no public exploit code.