Vulnerability in Linux
CVE-2021-47110
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.
EPSS: 0.002 (15.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.
Affected products
- Linux — versions 1e977aa12dd4f80688b1f243762212e75c6d7fe8, 2.6.26, 0
- Linux Linux_kernel — versions 5.13
Weakness classification (CWE)
Public proof-of-concept exploits
References
Frequently asked questions
- What is CVE-2021-47110?
- CVE-2021-47110 is a high-severity vulnerability in Linux, classified under Incomplete Cleanup. CVSS score: 7.1/10. Published 2024-03-15.
- How severe is CVE-2021-47110?
- High severity. CVSS v3 base score is 7.1 out of 10.
- Is CVE-2021-47110 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.