# CVE-2021-47110: linux: In the Linux kernel, the following vulnerability has been resolved:  x86/kvm: Disable kvmclock on all CPUs on shutdow...

CVE-2021-47110 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47110, released March 15, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-47110
- Priority: High
- CVSS: 7.1 (high)
- EPSS: 0.0024
- 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: Disable kvmclock on all CPUs on shutdown  Currenly, we disable kvmclock from machine_shutdown() hook and this only happens for boot CPU. We need to disable it for all CPUs to guard against memory corruption e.g. on restore from hibernate.  Note, writing '0' to kvmclock MSR doesn't clear memory location, it just prevents hypervisor from updating the location so for the short while after write and while CPU is still alive, the clock remains usable and correct so we don't need to switch to some other clocksource.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.46-1 | [DEBIAN-CVE-2021-47110](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47110.md) | Mar 15, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.46-1 | [DEBIAN-CVE-2021-47110](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47110.md) | Mar 15, 2024 |
| Linux | linux Debian 14 | 5.10.46-1 | [DEBIAN-CVE-2021-47110](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47110.md) | Mar 15, 2024 |

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