Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: fix missing sev_decommission in sev_receive_start DECOMMISSION the current SEV context if binding an ASID fails after RECEIVE_START. Per AMD's SEV API, RECEIVE_START generates a new guest context and thus needs to be paired with DECOMMISSION: The RECEIVE_START command is the only command other than the LAUNCH_START command that generates a new guest context and guest handle. The missing DECOMMISSION can result in subsequent SEV launch failures, as the firmware leaks memory and might not able to allocate more SEV guest contexts in the future. Note, LAUNCH_START suffered the same bug, but was previously fixed by commit 934002cd660b ("KVM: SVM: Call SEV Guest Decommission if ASID binding fails").
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.13, < 5.14.10 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/efd7866e114dcb44f86d151e843f8276b7efbc67Patch
- https://git.kernel.org/stable/c/f1815e0aa770f2127c5df31eb5c2f0e37b60fa77Patch
- https://git.kernel.org/stable/c/efd7866e114dcb44f86d151e843f8276b7efbc67Patch
- https://git.kernel.org/stable/c/f1815e0aa770f2127c5df31eb5c2f0e37b60fa77Patch
FAQ
What is CVE-2021-47389?
CVE-2021-47389 is a vulnerability with a CVSS score of 5.1 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: fix missing sev_decommission in sev_receive_start DECOMMISSION the current SEV context if binding an ASID fails after RE...
How severe is CVE-2021-47389?
CVE-2021-47389 has been rated MEDIUM with a CVSS base score of 5.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47389?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.