UBUNTU-CVE-2021-4093
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.
02 / AFFECTED SOFTWARE
Affected packages
29 explicit affected versions
7 explicit affected versions
2 explicit affected versions
4 explicit affected versions
7 explicit affected versions
33 explicit affected versions
2 explicit affected versions
38 explicit affected versions
10 explicit affected versions
3 explicit affected versions
10 explicit affected versions
21 explicit affected versions
13 explicit affected versions
11 explicit affected versions
2 explicit affected versions
2 explicit affected versions
23 explicit affected versions
5 explicit affected versions
11 explicit affected versions
44 explicit affected versions
4 explicit affected versions
4 explicit affected versions
9 explicit affected versions
12 explicit affected versions
7 explicit affected versions
5 explicit affected versions
16 explicit affected versions
43 explicit affected versions
11 explicit affected versions
6 explicit affected versions
11 explicit affected versions
50 explicit affected versions
12 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES