Linux Kernel up to 5.4.124/5.10.42/5.12.9 kvm kvm_cpu_down_prepare privilege escalation

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.4.124/5.10.42/5.12.9 and classified as problematic. Affected by this issue is the function kvm_cpu_down_prepare of the component kvm. The manipulation results in an unknown weakness. This vulnerability is identified as CVE-2021-47112. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 5.4.124/5.10.42/5.12.9. Affected is the function kvm_cpu_down_prepare of the component kvm. The impact remains unknown. CVE summarizes:

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.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2021-47112 since 03/04/2024. There are known technical details, but no exploit is available.

Upgrading to version 5.4.125, 5.10.43, 5.12.10 or 5.13 eliminates this vulnerability. Applying the patch 7620a669111b/38b858da1c58/d1629b5b925d/8b79feffeca2 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.4.124
• 5.10.0
• 5.10.1
• 5.10.2
• 5.10.3
• 5.10.4
• 5.10.5
• 5.10.6
• 5.10.7
• 5.10.8
• 5.10.9
• 5.10.10
• 5.10.11
• 5.10.12
• 5.10.13
• 5.10.14
• 5.10.15
• 5.10.16
• 5.10.17
• 5.10.18
• 5.10.19
• 5.10.20
• 5.10.21
• 5.10.22
• 5.10.23
• 5.10.24
• 5.10.25
• 5.10.26
• 5.10.27
• 5.10.28
• 5.10.29
• 5.10.30
• 5.10.31
• 5.10.32
• 5.10.33
• 5.10.34
• 5.10.35
• 5.10.36
• 5.10.37
• 5.10.38
• 5.10.39
• 5.10.40
• 5.10.41
• 5.10.42
• 5.12.0
• 5.12.1
• 5.12.2
• 5.12.3
• 5.12.4
• 5.12.5
• 5.12.6
• 5.12.7
• 5.12.8
• 5.12.9

License

• open-source

Website

• Vendor: https://www.kernel.org/

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