GSD-2021-1000407 userfaultfd: release page in error path to avoid BUG_ON
A local attacker can trigger a kernel BUG_ON crash in userfaultfd error handling, 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
- None listed
What is GSD-2021-1000407?
GSD-2021-1000407 is a denial of service vulnerability in Kernel, published on 31 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
userfaultfd: release page in error path to avoid BUG_ON
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 v5.4.120 by commit b3f1731c6d7fbc1ebe3ed8eff6d6bec56d76ff43, it was introduced in version v4.11 by commit cb658a453b9327ce96ce5222c24d162b5b65b564. For more details please see the references link.
Which versions are affected by GSD-2021-1000407?
1 open source package ship an affected version, including Kernel.
| Package | Affected | Fixed in |
|---|---|---|
Kernel Linux | All versions | None |
How do I fix GSD-2021-1000407?
No fix has been published for GSD-2021-1000407 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is GSD-2021-1000407 being exploited?
There is no known exploitation of GSD-2021-1000407 in the wild and no public exploit code.