GSD-2021-1002721 netfs: Fix lockdep warning from taking sb_writers whilst holding mmap_lock
A lockdep warning in the Linux kernel netfs subsystem could lead to a denial of service, requiring a kernel patch to resolve.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is GSD-2021-1002721?
GSD-2021-1002721 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
netfs: Fix lockdep warning from taking sb_writers whilst holding mmap_lock
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 v5.15.10 by commit 1ac287b7b61520d00255b4ec8c8e2dd5f0277169, it was introduced in version v5.13 by commit 726218fdc22c9b52f16e1228499a804bbf262a20. For more details please see the references link.
Which versions are affected by GSD-2021-1002721?
1 open source package ship an affected version, including Kernel.
| Package | Affected | Fixed in |
|---|---|---|
Kernel Linux | All versions | None |
How do I fix GSD-2021-1002721?
No fix has been published for GSD-2021-1002721 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-2021-1002721 being exploited?
There is no known exploitation of GSD-2021-1002721 in the wild and no public exploit code.