GSD-2021-1000147 btrfs: fix race between transaction aborts and fsyncs leading to use-after-free
A race condition in the btrfs filesystem allows local attackers to trigger a use-after-free, potentially leading to code execution or privilege escalation.
- 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-2021-1000147?
GSD-2021-1000147 is an use after free 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
btrfs: fix race between transaction aborts and fsyncs leading to use-after-free
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 v5.10.36 by commit a4794be7b00b7eda4b45fffd283ab7d76df7e5d6, it was introduced in version v5.7 by commit ef67963dac255b293e19815ea3d440567be4626f. For more details please see the references link.
Which versions are affected by GSD-2021-1000147?
1 open source package ship an affected version, including Kernel.
| Package | Affected | Fixed in |
|---|---|---|
Kernel Linux | All versions | None |
How do I fix GSD-2021-1000147?
No fix has been published for GSD-2021-1000147 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-2021-1000147 being exploited?
There is no known exploitation of GSD-2021-1000147 in the wild and no public exploit code.