CVEvulnerability

CVE-2021-3653

8.8 HIGH Published 2021-09-29 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-09-29
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
8.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS 2.0 ([email protected])
6.1 MEDIUM — AV:L/AC:L/Au:N/C:P/I:P/A:C
Weaknesses
CWE-862

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.

Affected configurations

• linux linux kernel (>= 2.6.30 < 4.4.282) • linux linux kernel (>= 4.5 < 4.9.281) • linux linux kernel (>= 4.10 < 4.14.245) • linux linux kernel (>= 4.15 < 4.19.205) • linux linux kernel (>= 4.20 < 5.4.142) • linux linux kernel (>= 5.5 < 5.10.60) • linux linux kernel (>= 5.11 < 5.13.12) • linux linux kernel 5.14 • redhat enterprise linux 7.0 • debian debian linux 9.0

Related

Weakness · CWE (1)

  • CWE-862 Missing Authorization weakness

References