Lucene search

K
cveLinuxCVE-2021-47110
HistoryMar 15, 2024 - 9:15 p.m.

CVE-2021-47110

2024-03-1521:15:06
Linux
web.nvd.nist.gov
57
cve-2021-47110
linux kernel
vulnerability
x86
kvm
kvmclock
memory corruption
hibernate
nvd

AI Score

6.6

Confidence

Low

EPSS

0

Percentile

15.5%

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.

Affected configurations

Vulners
Node
linuxlinux_kernelRange5.4.05.4.125
OR
linuxlinux_kernelRange5.5.05.10.43
OR
linuxlinux_kernelRange5.11.05.12.10
OR
linuxlinux_kernelRange5.13.0
VendorProductVersionCPE
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "arch/x86/include/asm/kvm_para.h",
      "arch/x86/kernel/kvm.c",
      "arch/x86/kernel/kvmclock.c"
    ],
    "versions": [
      {
        "version": "1da177e4c3f4",
        "lessThan": "9084fe1b3572",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1da177e4c3f4",
        "lessThan": "3b0becf8b1ec",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1da177e4c3f4",
        "lessThan": "1df2dc09926f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1da177e4c3f4",
        "lessThan": "c02027b5742b",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "arch/x86/include/asm/kvm_para.h",
      "arch/x86/kernel/kvm.c",
      "arch/x86/kernel/kvmclock.c"
    ],
    "versions": [
      {
        "version": "5.4.125",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.10.43",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.12.10",
        "lessThanOrEqual": "5.12.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.13",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

AI Score

6.6

Confidence

Low

EPSS

0

Percentile

15.5%