GSD-2021-1002621 net: netlink: af_netlink: Prevent empty skb by adding a check on len.
A missing length check in the Linux kernel netlink subsystem allows local attackers to cause a denial of service via empty socket buffers.
- 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-2021-1002621?
GSD-2021-1002621 is a denial of service vulnerability in Kernel, published on 27 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
net: netlink: af_netlink: Prevent empty skb by adding a check on len.
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 v4.9.294 by commit 40cf2e058832d9cfaae98dfd77334926275598b6. For more details please see the references link.
Which versions are affected by GSD-2021-1002621?
1 open source package ship an affected version, including Kernel.
| Package | Affected | Fixed in |
|---|---|---|
Kernel Linux | All versions | None |
How do I fix GSD-2021-1002621?
No fix has been published for GSD-2021-1002621 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-2021-1002621 being exploited?
There is no known exploitation of GSD-2021-1002621 in the wild and no public exploit code.