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CVE-2021-3653 A flaw was found in the KVM's AMD code for supporting SVM nested virtualization
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 products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| kernel | Versions not published |
References
- bugzilla.redhat.com bugzilla.redhat.com
- www.openwall.com www.openwall.com
- [debian-lts-announce] 20211015 [SECURITY] [DLA 2785-1] linux-4.19 security update lists.debian.org
- [debian-lts-announce] 20211216 [SECURITY] [DLA 2843-1] linux security update lists.debian.org
- packetstormsecurity.com packetstormsecurity.com
Timeline
- Published
- Last modified
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