Red Hat: CVE-2021-4093: out-of-bounds read/write in sev_es_string_io (Multiple Advisories)
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.
Solution(s)
- redhat-upgrade-kernel
- redhat-upgrade-kernel-rt
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