CVE-2021-4093
Summary
| CVE | CVE-2021-4093 |
|---|---|
| State | PUBLIC |
| Assigner | [email protected] |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2022-02-18 18:15:00 UTC |
| Updated | 2023-11-07 03:40:00 UTC |
| 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. |
Risk And Classification
Problem Types: CWE-125 | CWE-787
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Canonical | Ubuntu Linux | 20.04 | All | All | All |
| Operating System | Canonical | Ubuntu Linux | 21.10 | All | All | All |
| Operating System | Fedoraproject | Fedora | 35 | All | All | All |
| Operating System | Linux | Linux Kernel | All | All | All | All |
| Operating System | Redhat | Enterprise Linux | 8.0 | All | All | All |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| 2028584 – (CVE-2021-4093) CVE-2021-4093 kernel: KVM: SVM: out-of-bounds read/write in sev_es_string_io | MISC | bugzilla.redhat.com | |
| 2222 - project-zero - Project Zero - Monorail | MISC | bugs.chromium.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.