CVE-2021-3653

Advisory lineage Upstream: 0 Downstream: 53
Modified
Published: 29 Sept 2021, 19:41
Last modified:03 Aug 2024, 17:01

Vulnerability Summary

Overall Risk (default)
medium
45/100
CVSS Score
8.8 HIGH
v3.1 (nvd)
EPSS Score
0.01% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

29 Sept 2021, 19:41
Published
Vulnerability first disclosed
03 Aug 2024, 17:01
Last Modified
Vulnerability information updated

Description

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 Metrics

  • v3.1•HIGH•Score: 8.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
  • v2.0•MEDIUM•Score: 6.1AV:L/AC:L/Au:N/C:P/I:P/A:C

EPSS Trends

Current EPSS score: 0.01%• Percentile: 3%

Techniques & Countermeasures

  • CWE-862•Missing Authorization

    The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Affected Systems

  • debian•debian_linux

    9.0

  • linux•linux_kernel

    ≥ 2.6.30, < 4.4.282 | ≥ 4.5, < 4.9.281 | ≥ 4.10, < 4.14.245 | ≥ 4.15, < 4.19.205 | ≥ 4.20, < 5.4.142 | ≥ 5.5, < 5.10.60 | ≥ 5.11, < 5.13.12 | 5.14:rc1 | 5.14:rc2 | 5.14:rc3 | 5.14:rc4 | 5.14:rc5 | 5.14:rc6

  • redhat•enterprise_linux

    7.0

References (5)