GSD-2021-1000396 KVM: x86/mmu: Alloc page for PDPTEs when shadowing 32-bit NPT with 64-bit
A memory corruption flaw in KVM's MMU allows local attackers to escalate privileges or cause 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-2021-1000396?
GSD-2021-1000396 is a memory corruption 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
KVM: x86/mmu: Alloc page for PDPTEs when shadowing 32-bit NPT with 64-bit
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 v5.10.37 by commit c8b49e01a23b0f5a97dc977812adaf042b474eb7, it was introduced in version v4.19 by commit ee6268ba3a6861b2806e569bff7fe91fbdf846dd. For more details please see the references link.
Which versions are affected by GSD-2021-1000396?
1 open source package ship an affected version, including Kernel.
| Package | Affected | Fixed in |
|---|---|---|
Kernel Linux | All versions | None |
How do I fix GSD-2021-1000396?
No fix has been published for GSD-2021-1000396 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is GSD-2021-1000396 being exploited?
There is no known exploitation of GSD-2021-1000396 in the wild and no public exploit code.