🛡️ UBUNTU-CVE-2021-4093
⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2021-12-13
Updated 2026-06-08
Modified 2026-02-04
Fix URL N/A

Affected Packages

Software From version Fixed in
linux-aws-5.0 — —
linux-aws-5.11 — 5.11.0-1028.31~20.04.1
linux-aws-5.13 — 5.13.0-1012.13~20.04.1
linux-aws-5.3 — —
linux-aws-5.8 — —
linux-azure — —
linux-azure-5.11 — 5.11.0-1028.31~20.04.2
linux-azure-5.13 — 5.13.0-1013.15~20.04.1
linux-azure-5.3 — —
linux-azure-5.8 — —
linux-azure-edge — —
linux-gcp — —
linux-gcp-5.11 — 5.11.0-1029.33~20.04.3
linux-gcp-5.13 — 5.13.0-1013.16~20.04.1
linux-gcp-5.3 — —
linux-gcp-5.8 — —
linux-gke-4.15 — —
linux-hwe — —
linux-hwe-5.11 — —
linux-hwe-5.13 — 5.13.0-28.31~20.04.1
linux-hwe-5.8 — —
linux-hwe-edge — —
linux-intel-5.13 — —
linux-oem — —
linux-oem-5.13 — 5.13.0-1029.36
linux-oem-5.14 — 5.14.0-1008.8
linux-oem-5.6 — —
linux-oracle-5.0 — —
linux-oracle-5.11 — 5.11.0-1028.31~20.04.1
linux-oracle-5.13 — 5.13.0-1016.20~20.04.1
linux-oracle-5.3 — —
linux-oracle-5.8 — —

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