Incomplete Cleanup Affecting kernel package, versions <0:4.14.348-265.565.amzn2
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Test your applications- Snyk ID SNYK-AMZN2-KERNEL-7681620
- published 14 Aug 2024
- disclosed 15 Mar 2024
Introduced: 15 Mar 2024
CVE-2021-47112 Open this link in a new tabHow to fix?
Upgrade Amazon-Linux:2 kernel to version 0:4.14.348-265.565.amzn2 or higher.
This issue was patched in ALAS2-2024-2589.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2 relevant fixed versions and status.
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.
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-47112
- https://git.kernel.org/stable/c/38b858da1c58ad46519a257764e059e663b59ff2
- https://git.kernel.org/stable/c/7620a669111b52f224d006dea9e1e688e2d62c54
- https://git.kernel.org/stable/c/8b79feffeca28c5459458fe78676b081e87c93a4
- https://git.kernel.org/stable/c/d1629b5b925de9b27979e929dae7fcb766daf6b6