CVE-2022-49611 x86/speculation: Fill RSB on vmexit for IBRS
The Linux kernel now fills the Return Stack Buffer on VM exit to prevent speculation attacks when IBRS is enabled.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-49611?
CVE-2022-49611 is a medium-severity vulnerability in Linux kernel, published on 26 Feb 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
x86/speculation: Fill RSB on vmexit for IBRS
Prevent RSB underflow/poisoning attacks with RSB. While at it, add a bunch of comments to attempt to document the current state of tribal knowledge about RSB attacks and what exactly is being mitigated.
Which versions are affected by CVE-2022-49611?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-49611?
Apply the vendor's patch.
Is CVE-2022-49611 being exploited?
There is no known exploitation of CVE-2022-49611 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-49611, GHSA-3v7p-2jr8-qj72, UBUNTU-CVE-2022-49611.