CVE-2021-3653
- State
- Published
- Severity
- Not scored
- Published
- Sep 29, 2021
- Updated
- Aug 3, 2024
- Reserved
- Jul 19, 2021
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.
Scores
The record has no CVSS score.
Weaknesses
Affected Products
| Product | Versions |
|---|---|
kerneln/a |
|
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1983686
- https://www.openwall.com/lists/oss-security/2021/08/16/1
- [debian-lts-announce] 20211015 [SECURITY] [DLA 2785-1] linux-4.19 security updatemailing-list
- [debian-lts-announce] 20211216 [SECURITY] [DLA 2843-1] linux security updatemailing-list
- http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html
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