CVE - CVE-2021-47110

CVE-ID
CVE-2021-47110	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/1df2dc09926f61319116c80ee85701df33577d70 URL:https://git.kernel.org/stable/c/1df2dc09926f61319116c80ee85701df33577d70 MISC:https://git.kernel.org/stable/c/3b0becf8b1ecf642a9edaf4c9628ffc641e490d6 URL:https://git.kernel.org/stable/c/3b0becf8b1ecf642a9edaf4c9628ffc641e490d6 MISC:https://git.kernel.org/stable/c/9084fe1b3572664ad276f427dce575f580c9799a URL:https://git.kernel.org/stable/c/9084fe1b3572664ad276f427dce575f580c9799a MISC:https://git.kernel.org/stable/c/c02027b5742b5aa804ef08a4a9db433295533046 URL:https://git.kernel.org/stable/c/c02027b5742b5aa804ef08a4a9db433295533046
Assigning CNA
kernel.org
Date Record Created
20240304	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240304)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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