GSD-2021-1001843 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-2021-1001843?
GSD-2021-1001843 is a vulnerability in Kernel, published on 28 Oct 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 v5.10.76 by commit 3cda4bfffd4f755645577aaa9e96a606657b4525, it was introduced in version v5.7 by commit 63b2d4174c4ad1f40b48d7138e71bcb564c1fe03. For more details please see the references link.
Which versions are affected by GSD-2021-1001843?
1 open source package ship an affected version, including Kernel.
| Package | Affected | Fixed in |
|---|---|---|
Kernel Linux | All versions | None |
How do I fix GSD-2021-1001843?
No fix has been published for GSD-2021-1001843 yet. Limit exposure of the affected software until one is available.
Is GSD-2021-1001843 being exploited?
There is no known exploitation of GSD-2021-1001843 in the wild and no public exploit code.