gsd-2021-47110
Vulnerability from gsd
Modified
2024-03-05 06:03
Details
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.
Aliases


To clipboard 

{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-47110"
      ],
      "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/kvm: Disable kvmclock on all CPUs on shutdown\n\nCurrenly, we disable kvmclock from machine_shutdown() hook and this\nonly happens for boot CPU. We need to disable it for all CPUs to\nguard against memory corruption e.g. on restore from hibernate.\n\nNote, writing \u00270\u0027 to kvmclock MSR doesn\u0027t clear memory location, it\njust prevents hypervisor from updating the location so for the short\nwhile after write and while CPU is still alive, the clock remains usable\nand correct so we don\u0027t need to switch to some other clocksource.",
      "id": "GSD-2021-47110",
      "modified": "2024-03-05T06:03:55.142933Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@kernel.org",
        "ID": "CVE-2021-47110",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Linux",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_name": "1da177e4c3f4",
                          "version_value": "9084fe1b3572"
                        },
                        {
                          "version_value": "not down converted",
                          "x_cve_json_5_version_data": {
                            "defaultStatus": "affected",
                            "versions": [
                              {
                                "lessThanOrEqual": "5.4.*",
                                "status": "unaffected",
                                "version": "5.4.125",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "5.10.*",
                                "status": "unaffected",
                                "version": "5.10.43",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "5.12.*",
                                "status": "unaffected",
                                "version": "5.12.10",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "*",
                                "status": "unaffected",
                                "version": "5.13",
                                "versionType": "original_commit_for_fix"
                              }
                            ]
                          }
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Linux"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/kvm: Disable kvmclock on all CPUs on shutdown\n\nCurrenly, we disable kvmclock from machine_shutdown() hook and this\nonly happens for boot CPU. We need to disable it for all CPUs to\nguard against memory corruption e.g. on restore from hibernate.\n\nNote, writing \u00270\u0027 to kvmclock MSR doesn\u0027t clear memory location, it\njust prevents hypervisor from updating the location so for the short\nwhile after write and while CPU is still alive, the clock remains usable\nand correct so we don\u0027t need to switch to some other clocksource."
          }
        ]
      },
      "generator": {
        "engine": "bippy-8df59b4913de"
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "n/a"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://git.kernel.org/stable/c/9084fe1b3572664ad276f427dce575f580c9799a",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/9084fe1b3572664ad276f427dce575f580c9799a"
          },
          {
            "name": "https://git.kernel.org/stable/c/3b0becf8b1ecf642a9edaf4c9628ffc641e490d6",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/3b0becf8b1ecf642a9edaf4c9628ffc641e490d6"
          },
          {
            "name": "https://git.kernel.org/stable/c/1df2dc09926f61319116c80ee85701df33577d70",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/1df2dc09926f61319116c80ee85701df33577d70"
          },
          {
            "name": "https://git.kernel.org/stable/c/c02027b5742b5aa804ef08a4a9db433295533046",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/c02027b5742b5aa804ef08a4a9db433295533046"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/kvm: Disable kvmclock on all CPUs on shutdown\n\nCurrenly, we disable kvmclock from machine_shutdown() hook and this\nonly happens for boot CPU. We need to disable it for all CPUs to\nguard against memory corruption e.g. on restore from hibernate.\n\nNote, writing \u00270\u0027 to kvmclock MSR doesn\u0027t clear memory location, it\njust prevents hypervisor from updating the location so for the short\nwhile after write and while CPU is still alive, the clock remains usable\nand correct so we don\u0027t need to switch to some other clocksource."
          }
        ],
        "id": "CVE-2021-47110",
        "lastModified": "2024-03-17T22:38:29.433",
        "metrics": {},
        "published": "2024-03-15T21:15:06.530",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1df2dc09926f61319116c80ee85701df33577d70"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3b0becf8b1ecf642a9edaf4c9628ffc641e490d6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9084fe1b3572664ad276f427dce575f580c9799a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c02027b5742b5aa804ef08a4a9db433295533046"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    }
  }
}


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