GSD-2021-1000394 KVM: Stop looking for coalesced MMIO zones if the bus is destroyed
A use-after-free vulnerability in KVM's coalesced MMIO handling allows local attackers to cause denial of service or potentially escalate privileges.
- 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-2021-1000394?
GSD-2021-1000394 is an use after free 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: Stop looking for coalesced MMIO zones if the bus is destroyed
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 2a20592baff59c5351c5200ec667e1a2aa22af85, it was introduced in version v5.9 by commit f65886606c2d3b562716de030706dfe1bea4ed5e. For more details please see the references link.
Which versions are affected by GSD-2021-1000394?
1 open source package ship an affected version, including Kernel.
| Package | Affected | Fixed in |
|---|---|---|
Kernel Linux | All versions | None |
How do I fix GSD-2021-1000394?
No fix has been published for GSD-2021-1000394 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is GSD-2021-1000394 being exploited?
There is no known exploitation of GSD-2021-1000394 in the wild and no public exploit code.