GSD-2021-1001216 ext4: fix possible UAF when remounting r/o a mmp-protected file system
A use-after-free vulnerability in the Linux kernel ext4 filesystem allows local attackers with high privileges to cause a denial of service or potentially escalate privileges when remounting MMP-protected filesystems.
- 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-2021-1001216?
GSD-2021-1001216 is an use after free vulnerability in Kernel, published on 3 Aug 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
ext4: fix possible UAF when remounting r/o a mmp-protected file system
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 v5.13.3 by commit 7ed572cdf11081f8f9e07abd4bea56a3f2c4edbd. For more details please see the references link.
Which versions are affected by GSD-2021-1001216?
1 open source package ship an affected version, including Kernel.
| Package | Affected | Fixed in |
|---|---|---|
Kernel Linux | All versions | None |
How do I fix GSD-2021-1001216?
No fix has been published for GSD-2021-1001216 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-2021-1001216 being exploited?
There is no known exploitation of GSD-2021-1001216 in the wild and no public exploit code.