GSD-2021-1001744 blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd
A use-after-free vulnerability in the Linux kernel block cgroup subsystem allows local attackers to cause denial of service or escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is GSD-2021-1001744?
GSD-2021-1001744 is an use after free vulnerability in Kernel, published on 19 Oct 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd
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 v5.14.9 by commit 7c2c69e010431b0157c9454adcdd2305809bf9fb. For more details please see the references link.
Which versions are affected by GSD-2021-1001744?
1 open source package ship an affected version, including Kernel.
| Package | Affected | Fixed in |
|---|---|---|
Kernel Linux | All versions | None |
How do I fix GSD-2021-1001744?
No fix has been published for GSD-2021-1001744 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-2021-1001744 being exploited?
There is no known exploitation of GSD-2021-1001744 in the wild and no public exploit code.