Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 5.4.125 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/1df2dc09926f61319116c80ee85701df33577d70Patch
- https://git.kernel.org/stable/c/3b0becf8b1ecf642a9edaf4c9628ffc641e490d6Patch
- https://git.kernel.org/stable/c/9084fe1b3572664ad276f427dce575f580c9799aPatch
- https://git.kernel.org/stable/c/c02027b5742b5aa804ef08a4a9db433295533046Patch
- https://git.kernel.org/stable/c/1df2dc09926f61319116c80ee85701df33577d70Patch
- https://git.kernel.org/stable/c/3b0becf8b1ecf642a9edaf4c9628ffc641e490d6Patch
- https://git.kernel.org/stable/c/9084fe1b3572664ad276f427dce575f580c9799aPatch
- https://git.kernel.org/stable/c/c02027b5742b5aa804ef08a4a9db433295533046Patch
FAQ
What is CVE-2021-47110?
CVE-2021-47110 is a vulnerability with a CVSS score of 7.1 (HIGH). 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...
How severe is CVE-2021-47110?
CVE-2021-47110 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47110?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.