GSD-2021-1002193 mm: filemap: check if THP has hwpoisoned subpage for PMD page fault
A missing check for hardware-poisoned subpages in Transparent Huge Pages during PMD faults can cause kernel crashes, requiring a kernel upgrade.
- 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-2021-1002193?
GSD-2021-1002193 is a memory corruption vulnerability in Kernel, published on 14 Nov 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
mm: filemap: check if THP has hwpoisoned subpage for PMD page fault
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 by commit eac96c3efdb593df1a57bb5b95dbe037bfa9a522, it was introduced in version v4.8 by commit 800d8c63b2e989c2e349632d1648119bf5862f01. For more details please see the references link.
Which versions are affected by GSD-2021-1002193?
1 open source package ship an affected version, including Kernel.
| Package | Affected | Fixed in |
|---|---|---|
Kernel Linux | All versions | None |
How do I fix GSD-2021-1002193?
No fix has been published for GSD-2021-1002193 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is GSD-2021-1002193 being exploited?
There is no known exploitation of GSD-2021-1002193 in the wild and no public exploit code.