GSD-2022-1001778 KVM: x86/mmu: Zap _all_ roots when unmapping gfn range in TDP MMU
A flaw in the Linux Kernel KVM TDP MMU allows a local attacker to cause a denial of service by triggering improper root zapping during memory unmapping.
- 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-2022-1001778?
GSD-2022-1001778 is a denial of service vulnerability in Kernel, published on 24 Apr 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
KVM: x86/mmu: Zap all roots when unmapping gfn range in TDP MMU
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 v5.15.33 by commit af47248407c0c5ae52a752af1ab5ce5b0db91502, it was introduced in version v5.13 by commit b7cccd397f310739fb85383033e95580f99927e0. For more details please see the references link.
Which versions are affected by GSD-2022-1001778?
1 open source package ship an affected version, including Kernel.
| Package | Affected | Fixed in |
|---|---|---|
Kernel Linux | All versions | None |
How do I fix GSD-2022-1001778?
No fix has been published for GSD-2022-1001778 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-2022-1001778 being exploited?
There is no known exploitation of GSD-2022-1001778 in the wild and no public exploit code.