Missing Authorization Affecting perf-debuginfo package, versions <0:4.18.0-305.25.1.el8_4


Severity

Recommended
0.0
high
0
10

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-ROCKY8-PERFDEBUGINFO-3289886
  • published3 Feb 2023
  • disclosed4 Mar 2022

Introduced: 4 Mar 2022

CVE-2021-3656  (opens in a new tab)
CWE-862  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:8 perf-debuginfo to version 0:4.18.0-305.25.1.el8_4 or higher.
This issue was patched in RLSA-2021:4056.

NVD Description

Note: Versions mentioned in the description apply only to the upstream perf-debuginfo package and not the perf-debuginfo package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:8 relevant fixed versions and status.

A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the "virt_ext" field, this issue could allow a malicious L1 to disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape.

CVSS Scores

version 3.1