Resource Injection Affecting kernel-rt package, versions *
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Test your applications- Snyk ID SNYK-RHEL7-KERNELRT-6456542
- published 17 Mar 2024
- disclosed 15 Mar 2024
Introduced: 15 Mar 2024
CVE-2021-47110 Open this link in a new tabHow to fix?
There is no fixed version for RHEL:7 kernel-rt.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt package and not the kernel-rt package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
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.
References
- https://access.redhat.com/security/cve/CVE-2021-47110
- https://git.kernel.org/stable/c/1df2dc09926f61319116c80ee85701df33577d70
- https://git.kernel.org/stable/c/3b0becf8b1ecf642a9edaf4c9628ffc641e490d6
- https://git.kernel.org/stable/c/9084fe1b3572664ad276f427dce575f580c9799a
- https://git.kernel.org/stable/c/c02027b5742b5aa804ef08a4a9db433295533046