CVE-2021-4093
High
Description
A flaw was found in the KVM's AMD code for supporting the Secure Encrypted Virtualization-Encrypted State (SEV-ES). A KVM guest using SEV-ES can trigger out-of-bounds reads and writes in the host kernel via a malicious VMGEXIT for a string I/O instruction (for example, outs or ins) using the exit reason SVM_EXIT_IOIO. This issue results in a crash of the entire system or a potential guest-to-host escape scenario.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Linux Kernel
PublishedFeb 18, 2022
First seenFeb 18, 2022
Weakness typeCWE-125Out-of-bounds read
How to fix
Update
- linux linux_kernel5.14.16 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.11 ≤ v < 5.14.16 | 5.14.16 |
| redhat enterprise_linux | 8.0 | — |
| fedoraproject fedora | 35 | — |
| canonical ubuntu_linux | 20.04, 21.10 | — |
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