GSD-2021-1000439 KVM: Stop looking for coalesced MMIO zones if the bus is destroyed
A null pointer dereference in KVM's coalesced MMIO handling can cause a kernel crash, requiring a local attacker with guest access to trigger.
- 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-2021-1000439?
GSD-2021-1000439 is a 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 v5.4.119 by commit 7d1bc32d6477ff96a32695ea4be8144e4513ab2d, it was introduced in version v5.4.66 by commit 41b2ea7a6a11e2b1a7f2c29e1675a709a6b2b98d. For more details please see the references link.
Which versions are affected by GSD-2021-1000439?
1 open source package ship an affected version, including Kernel.
| Package | Affected | Fixed in |
|---|---|---|
Kernel Linux | All versions | None |
How do I fix GSD-2021-1000439?
No fix has been published for GSD-2021-1000439 yet. Limit exposure of the affected software until one is available.
Is GSD-2021-1000439 being exploited?
There is no known exploitation of GSD-2021-1000439 in the wild and no public exploit code.