# CVE-2021-47389: linux: In the Linux kernel, the following vulnerability has been resolved:  KVM: SVM: fix missing sev_decommission in sev_re...

CVE-2021-47389 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47389, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47389
- Priority: Routine
- CVSS: 5.1 (medium)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2024

## 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").

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.12-1 | [DEBIAN-CVE-2021-47389](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47389.md) | May 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.14.12-1 | [DEBIAN-CVE-2021-47389](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47389.md) | May 21, 2024 |
| Linux | linux Debian 14 | 5.14.12-1 | [DEBIAN-CVE-2021-47389](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47389.md) | May 21, 2024 |

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