Missing Authorization Affecting kernel-default package, versions <5.3.18-59.24.1


Severity

Recommended
0.0
high
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.08% (37th percentile)

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  • Snyk IDSNYK-SLES153-KERNELDEFAULT-2664731
  • published14 Apr 2022
  • disclosed23 Sept 2021

Introduced: 23 Sep 2021

CVE-2021-3653  (opens in a new tab)
CWE-862  (opens in a new tab)

How to fix?

Upgrade SLES:15.3 kernel-default to version 5.3.18-59.24.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-default package and not the kernel-default package as distributed by SLES. See How to fix? for SLES:15.3 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 "int_ctl" field, this issue could allow a malicious L1 to enable AVIC support (Advanced Virtual Interrupt Controller) 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. This flaw affects Linux kernel versions prior to 5.14-rc7.

CVSS Scores

version 3.1