CVE-2021-47217 (GCVE-0-2021-47217)

Vulnerability from cvelistv5 – Published: 2024-04-10 19:01 – Updated: 2026-05-11 13:50
VLAI
Title
x86/hyperv: Fix NULL deref in set_hv_tscchange_cb() if Hyper-V setup fails
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/hyperv: Fix NULL deref in set_hv_tscchange_cb() if Hyper-V setup fails Check for a valid hv_vp_index array prior to derefencing hv_vp_index when setting Hyper-V's TSC change callback. If Hyper-V setup failed in hyperv_init(), the kernel will still report that it's running under Hyper-V, but will have silently disabled nearly all functionality. BUG: kernel NULL pointer dereference, address: 0000000000000010 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] SMP CPU: 4 PID: 1 Comm: swapper/0 Not tainted 5.15.0-rc2+ #75 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:set_hv_tscchange_cb+0x15/0xa0 Code: <8b> 04 82 8b 15 12 17 85 01 48 c1 e0 20 48 0d ee 00 01 00 f6 c6 08 ... Call Trace: kvm_arch_init+0x17c/0x280 kvm_init+0x31/0x330 vmx_init+0xba/0x13a do_one_initcall+0x41/0x1c0 kernel_init_freeable+0x1f2/0x23b kernel_init+0x16/0x120 ret_from_fork+0x22/0x30
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: 93286261de1b46339aa27cd4c639b21778f6cade , < b20ec58f8a6f4fef32cc71480ddf824584e24743 (git)
Affected: 93286261de1b46339aa27cd4c639b21778f6cade , < b0e44dfb4e4c699cca33ede431b8d127e6e8d661 (git)
Affected: 93286261de1b46339aa27cd4c639b21778f6cade , < 9c177eee116cf888276d3748cb176e72562cfd5c (git)
Affected: 93286261de1b46339aa27cd4c639b21778f6cade , < 8823ea27fff6084bbb4bc71d15378fae0220b1d8 (git)
Affected: 93286261de1b46339aa27cd4c639b21778f6cade , < daf972118c517b91f74ff1731417feb4270625a4 (git)
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Linux Linux Affected: 4.16
Unaffected: 0 , < 4.16 (semver)
Unaffected: 4.19.218 , ≤ 4.19.* (semver)
Unaffected: 5.4.162 , ≤ 5.4.* (semver)
Unaffected: 5.10.82 , ≤ 5.10.* (semver)
Unaffected: 5.15.5 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
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If Hyper-V setup failed in\\nhyperv_init(), the kernel will still report that it\u0027s running under\\nHyper-V, but will have silently disabled nearly all functionality.\\n\\n  BUG: kernel NULL pointer dereference, address: 0000000000000010\\n  #PF: supervisor read access in kernel mode\\n  #PF: error_code(0x0000) - not-present page\\n  PGD 0 P4D 0\\n  Oops: 0000 [#1] SMP\\n  CPU: 4 PID: 1 Comm: swapper/0 Not tainted 5.15.0-rc2+ #75\\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\\n  RIP: 0010:set_hv_tscchange_cb+0x15/0xa0\\n  Code: \u003c8b\u003e 04 82 8b 15 12 17 85 01 48 c1 e0 20 48 0d ee 00 01 00 f6 c6 08\\n  ...\\n  Call Trace:\\n   kvm_arch_init+0x17c/0x280\\n   kvm_init+0x31/0x330\\n   vmx_init+0xba/0x13a\\n   do_one_initcall+0x41/0x1c0\\n   kernel_init_freeable+0x1f2/0x23b\\n   kernel_init+0x16/0x120\\n   ret_from_fork+0x22/0x30\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: x86/hyperv: Se corrige la desreferencia NULL en set_hv_tscchange_cb() si falla la configuraci\u00f3n de Hyper-V. Verifique si hay una matriz hv_vp_index v\u00e1lida antes de desreferenciar hv_vp_index al configurar la devoluci\u00f3n de llamada de cambio de TSC de Hyper-V. Si la configuraci\u00f3n de Hyper-V fall\u00f3 en hyperv_init(), el kernel a\u00fan informar\u00e1 que se est\u00e1 ejecutando bajo Hyper-V, pero habr\u00e1 deshabilitado silenciosamente casi todas las funciones. ERROR: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000010 #PF: acceso de lectura del supervisor en modo kernel #PF: error_code(0x0000) - p\u00e1gina no presente PGD 0 P4D 0 Oops: 0000 [#1] SMP CPU: 4 PID: 1 Comm: swapper/0 No contaminado 5.15.0-rc2+ #75 Nombre del hardware: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:set_hv_tscchange_cb+0x15/0xa0 C\u00f3digo: \u0026lt;8b\u0026gt; 04 82 8b 15 12 17 85 01 48 c1 e0 20 48 0d ee 00 01 00 f6 c6 08 ... Seguimiento de llamadas: kvm_arch_init+0x17c/0x280 kvm_init+0x31/0x330 vmx_init+0xba/0x13a do_one_initcall+0x41/0x1c0 kernel_init_freeable+0x1f2/0x23b kernel_init+0x16/0x120 ret_from_fork+0x22/0x30\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/x86/hyperv/hv_init.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"93286261de1b46339aa27cd4c639b21778f6cade\",\"lessThan\":\"b20ec58f8a6f4fef32cc71480ddf824584e24743\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"93286261de1b46339aa27cd4c639b21778f6cade\",\"lessThan\":\"b0e44dfb4e4c699cca33ede431b8d127e6e8d661\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"93286261de1b46339aa27cd4c639b21778f6cade\",\"lessThan\":\"9c177eee116cf888276d3748cb176e72562cfd5c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"93286261de1b46339aa27cd4c639b21778f6cade\",\"lessThan\":\"8823ea27fff6084bbb4bc71d15378fae0220b1d8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"93286261de1b46339aa27cd4c639b21778f6cade\",\"lessThan\":\"daf972118c517b91f74ff1731417feb4270625a4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/x86/hyperv/hv_init.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.218\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.162\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.82\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.5\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.16\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-06-17T18:03:45.646426Z\",\"id\":\"CVE-2021-47217\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.16\",\"versionEndExcluding\":\"4.19.218\",\"matchCriteriaId\":\"3917EFBF-AD24-48ED-B8B4-4F6BA6A5E0E0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.162\",\"matchCriteriaId\":\"51A152D8-D5CE-47BD-9041-DEE164DCE99D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.82\",\"matchCriteriaId\":\"AE501832-500C-4EF1-9489-5C13674F619D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.5\",\"matchCriteriaId\":\"2128A085-4C0C-4C1E-9E9C-0DD868E2170F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"357AA433-37E8-4323-BFB2-3038D6E4B414\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T14:02:59+00:00",
      "cve": "CVE-2021-47217",
      "id": "CVE-2021-47217",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: x86/hyperv: Fix NULL deref in set_hv_tscchange_cb() if Hyper-V setup fails",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47217.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-26T16:52:28Z",
      "cve": "CVE-2021-47217",
      "id": "CVE-2021-47217",
      "initial_release_date": "2024-04-15T23:20:41Z",
      "product_status:known_affected": "374",
      "product_status:known_not_affected": "146",
      "product_status:recommended": "532",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47217",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47217.json",
      "version": "48"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:32:07.432Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47217\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-17T18:03:45.646426Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-17T18:03:46.614Z\"}}], \"cna\": {\"title\": \"x86/hyperv: Fix NULL deref in set_hv_tscchange_cb() if Hyper-V setup fails\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"93286261de1b46339aa27cd4c639b21778f6cade\", \"lessThan\": \"b20ec58f8a6f4fef32cc71480ddf824584e24743\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"93286261de1b46339aa27cd4c639b21778f6cade\", \"lessThan\": \"b0e44dfb4e4c699cca33ede431b8d127e6e8d661\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"93286261de1b46339aa27cd4c639b21778f6cade\", \"lessThan\": \"9c177eee116cf888276d3748cb176e72562cfd5c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"93286261de1b46339aa27cd4c639b21778f6cade\", \"lessThan\": \"8823ea27fff6084bbb4bc71d15378fae0220b1d8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"93286261de1b46339aa27cd4c639b21778f6cade\", \"lessThan\": \"daf972118c517b91f74ff1731417feb4270625a4\", \"versionType\": \"git\"}], \"programFiles\": [\"arch/x86/hyperv/hv_init.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.16\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.16\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.218\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.162\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.82\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"arch/x86/hyperv/hv_init.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743\"}, {\"url\": \"https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661\"}, {\"url\": \"https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c\"}, {\"url\": \"https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8\"}, {\"url\": \"https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nx86/hyperv: Fix NULL deref in set_hv_tscchange_cb() if Hyper-V setup fails\\n\\nCheck for a valid hv_vp_index array prior to derefencing hv_vp_index when\\nsetting Hyper-V\u0027s TSC change callback.  If Hyper-V setup failed in\\nhyperv_init(), the kernel will still report that it\u0027s running under\\nHyper-V, but will have silently disabled nearly all functionality.\\n\\n  BUG: kernel NULL pointer dereference, address: 0000000000000010\\n  #PF: supervisor read access in kernel mode\\n  #PF: error_code(0x0000) - not-present page\\n  PGD 0 P4D 0\\n  Oops: 0000 [#1] SMP\\n  CPU: 4 PID: 1 Comm: swapper/0 Not tainted 5.15.0-rc2+ #75\\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\\n  RIP: 0010:set_hv_tscchange_cb+0x15/0xa0\\n  Code: \u003c8b\u003e 04 82 8b 15 12 17 85 01 48 c1 e0 20 48 0d ee 00 01 00 f6 c6 08\\n  ...\\n  Call Trace:\\n   kvm_arch_init+0x17c/0x280\\n   kvm_init+0x31/0x330\\n   vmx_init+0xba/0x13a\\n   do_one_initcall+0x41/0x1c0\\n   kernel_init_freeable+0x1f2/0x23b\\n   kernel_init+0x16/0x120\\n   ret_from_fork+0x22/0x30\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T07:37:36.278Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47217\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T07:37:36.278Z\", \"dateReserved\": \"2024-04-10T18:59:19.528Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-10T19:01:56.419Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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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.