CVE-2021-3653
CVSS V2 Medium 6.1
CVSS V3 High 8.8
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.
Overview
- CVE ID
- CVE-2021-3653
- Assigner
- secalert@redhat.com
- Vulnerability Status
- Undergoing Analysis
- Published Version
- 2021-09-29T20:15:08
- Last Modified Date
- 2022-03-31T19:45:45
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 1 | OR | 2.6.30 | 5.14 |
| cpe:2.3:o:linux:linux_kernel:5.14:-:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:linux:linux_kernel:5.14:rc3:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:linux:linux_kernel:5.14:rc4:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:linux:linux_kernel:5.14:rc5:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:linux:linux_kernel:5.14:rc6:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 1 | OR |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:L/AC:L/Au:N/C:P/I:P/A:C
- Access Vector
- LOCAL
- Access Compatibility
- LOW
- Authentication
- NONE
- Confidentiality Impact
- PARTIAL
- Integrity Impact
- PARTIAL
- Availability Impact
- COMPLETE
- Base Score
- 6.1
- Severity
- MEDIUM
- Exploitability Score
- 3.9
- Impact Score
- 8.5
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Attack Vector
- LOCAL
- Attack Compatibility
- LOW
- Privileges Required
- LOW
- User Interaction
- NONE
- Scope
- CHANGED
- Confidentiality Impact
- HIGH
- Availability Impact
- HIGH
- Base Score
- 8.8
- Base Severity
- HIGH
- Exploitability Score
- 2
- Impact Score
- 6
References
| Reference URL | Reference Tags |
|---|---|
| https://www.openwall.com/lists/oss-security/2021/08/16/1 | Mailing List Patch Third Party Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=1983686 | Issue Tracking Patch Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html | Mailing List Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html | Mailing List Third Party Advisory |
| http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html | Exploit Third Party Advisory VDB Entry |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-3653 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3653 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-04-04 00:39:19 | Added to TrackCVE | |||
| 2022-12-05 11:32:24 | 2021-09-29T20:15Z | 2021-09-29T20:15:08 | CVE Published Date | updated |
| 2022-12-05 11:32:24 | 2022-03-31T19:45:45 | CVE Modified Date | updated | |
| 2022-12-05 11:32:24 | Analyzed | Vulnerability Status | updated | |
| 2023-04-18 19:04:32 | Analyzed | Undergoing Analysis | Vulnerability Status | updated |