CVE-2021-47110 (GCVE-0-2021-47110)

Vulnerability from cvelistv5 – Published: 2024-03-15 20:14 – Updated: 2026-05-11 13:48
VLAI
Title
x86/kvm: Disable kvmclock on all CPUs on shutdown
Summary
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1e977aa12dd4f80688b1f243762212e75c6d7fe8 , < 9084fe1b3572664ad276f427dce575f580c9799a (git)
Affected: 1e977aa12dd4f80688b1f243762212e75c6d7fe8 , < 3b0becf8b1ecf642a9edaf4c9628ffc641e490d6 (git)
Affected: 1e977aa12dd4f80688b1f243762212e75c6d7fe8 , < 1df2dc09926f61319116c80ee85701df33577d70 (git)
Affected: 1e977aa12dd4f80688b1f243762212e75c6d7fe8 , < c02027b5742b5aa804ef08a4a9db433295533046 (git)
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Linux Linux Affected: 2.6.26
Unaffected: 0 , < 2.6.26 (semver)
Unaffected: 5.4.125 , ≤ 5.4.* (semver)
Unaffected: 5.10.43 , ≤ 5.10.* (semver)
Unaffected: 5.12.10 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.125\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.43\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.10\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"2.6.26\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-21T08:31:36.590Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47110\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-21T08:31:36.590Z\", \"dateReserved\": \"2024-03-04T18:12:48.836Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-15T20:14:19.183Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.