GSD-2021-1000259 udp: skip L4 aggregation for UDP tunnel packets
A flaw in Linux kernel UDP tunnel handling allows remote attackers to cause a denial of service via L4 aggregation issues.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is GSD-2021-1000259?
GSD-2021-1000259 is a denial of service vulnerability in Kernel, published on 31 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
udp: skip L4 aggregation for UDP tunnel packets
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 v5.12.4 by commit 450687386cd16d081b58cd7a342acff370a96078, it was introduced in version v5.6 by commit 9fd1ff5d2ac7181844735806b0a703c942365291. For more details please see the references link.
Which versions are affected by GSD-2021-1000259?
1 open source package ship an affected version, including Kernel.
| Package | Affected | Fixed in |
|---|---|---|
Kernel Linux | All versions | None |
How do I fix GSD-2021-1000259?
No fix has been published for GSD-2021-1000259 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-2021-1000259 being exploited?
There is no known exploitation of GSD-2021-1000259 in the wild and no public exploit code.