# CVE-2021-47112: linux: In the Linux kernel, the following vulnerability has been resolved:  x86/kvm: Teardown PV features on boot CPU as wel...

CVE-2021-47112 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47112, released March 15, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47112
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 15, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  x86/kvm: Teardown PV features on boot CPU as well  Various PV features (Async PF, PV EOI, steal time) work through memory shared with hypervisor and when we restore from hibernation we must properly teardown all these features to make sure hypervisor doesn't write to stale locations after we jump to the previously hibernated kernel (which can try to place anything there). For secondary CPUs the job is already done by kvm_cpu_down_prepare(), register syscore ops to do the same for boot CPU.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.46-1 | [DEBIAN-CVE-2021-47112](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47112.md) | Mar 15, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.46-1 | [DEBIAN-CVE-2021-47112](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47112.md) | Mar 15, 2024 |
| Linux | linux Debian 14 | 5.10.46-1 | [DEBIAN-CVE-2021-47112](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47112.md) | Mar 15, 2024 |

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