CVE-2022-49611: x86/speculation: Fill RSB on vmexit for IBRS
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.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2022-49611?
The CVE-2022-49611 vulnerability in the Linux Kernel is classified with a high severity due to its potential for RSB underflow attacks.
How do I fix CVE-2022-49611?
To fix CVE-2022-49611, update your Linux kernel to version 4.14.298 or later, or the corresponding version that addresses the vulnerability.
Which Linux Kernel versions are affected by CVE-2022-49611?
CVE-2022-49611 affects multiple versions of the Linux Kernel, specifically those prior to 4.14.298, 4.19.267, 5.4.218, 5.10.134, 5.15.58, and 5.18.15.
What type of attack does CVE-2022-49611 protect against?
CVE-2022-49611 protects against RSB underflow/poisoning attacks that exploit the return stack buffer.
Is there a workaround for CVE-2022-49611?
While the primary solution is to update the Linux Kernel, there are no widely recognized workarounds for CVE-2022-49611.