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CVE-2021-47463 (GCVE-0-2021-47463)

Vulnerability from cvelistv5 – Published: 2024-05-22 06:23 – Updated: 2026-05-11 13:55
VLAI
Title
mm/secretmem: fix NULL page->mapping dereference in page_is_secretmem()
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/secretmem: fix NULL page->mapping dereference in page_is_secretmem() Check for a NULL page->mapping before dereferencing the mapping in page_is_secretmem(), as the page's mapping can be nullified while gup() is running, e.g. by reclaim or truncation. BUG: kernel NULL pointer dereference, address: 0000000000000068 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 6 PID: 4173897 Comm: CPU 3/KVM Tainted: G W RIP: 0010:internal_get_user_pages_fast+0x621/0x9d0 Code: <48> 81 7a 68 80 08 04 bc 0f 85 21 ff ff 8 89 c7 be RSP: 0018:ffffaa90087679b0 EFLAGS: 00010046 RAX: ffffe3f37905b900 RBX: 00007f2dd561e000 RCX: ffffe3f37905b934 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffe3f37905b900 ... CR2: 0000000000000068 CR3: 00000004c5898003 CR4: 00000000001726e0 Call Trace: get_user_pages_fast_only+0x13/0x20 hva_to_pfn+0xa9/0x3e0 try_async_pf+0xa1/0x270 direct_page_fault+0x113/0xad0 kvm_mmu_page_fault+0x69/0x680 vmx_handle_exit+0xe1/0x5d0 kvm_arch_vcpu_ioctl_run+0xd81/0x1c70 kvm_vcpu_ioctl+0x267/0x670 __x64_sys_ioctl+0x83/0xa0 do_syscall_64+0x56/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-22 17:54 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 , < b77ba1e02345bafd703f0d407bdbd88c3be1f767 (git)
Affected: 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 , < 79f9bc5843142b649575f887dccdf1c07ad75c20 (git)
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Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.14.15 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
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      "published": "2024-05-22T07:15:11.193",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47463\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-22T07:15:11.193\",\"lastModified\":\"2026-06-17T04:17:31.997\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm/secretmem: fix NULL page-\u003emapping dereference in page_is_secretmem()\\n\\nCheck for a NULL page-\u003emapping before dereferencing the mapping in\\npage_is_secretmem(), as the page\u0027s mapping can be nullified while gup()\\nis running, e.g.  by reclaim or truncation.\\n\\n  BUG: kernel NULL pointer dereference, address: 0000000000000068\\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] PREEMPT SMP NOPTI\\n  CPU: 6 PID: 4173897 Comm: CPU 3/KVM Tainted: G        W\\n  RIP: 0010:internal_get_user_pages_fast+0x621/0x9d0\\n  Code: \u003c48\u003e 81 7a 68 80 08 04 bc 0f 85 21 ff ff 8 89 c7 be\\n  RSP: 0018:ffffaa90087679b0 EFLAGS: 00010046\\n  RAX: ffffe3f37905b900 RBX: 00007f2dd561e000 RCX: ffffe3f37905b934\\n  RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffe3f37905b900\\n  ...\\n  CR2: 0000000000000068 CR3: 00000004c5898003 CR4: 00000000001726e0\\n  Call Trace:\\n   get_user_pages_fast_only+0x13/0x20\\n   hva_to_pfn+0xa9/0x3e0\\n   try_async_pf+0xa1/0x270\\n   direct_page_fault+0x113/0xad0\\n   kvm_mmu_page_fault+0x69/0x680\\n   vmx_handle_exit+0xe1/0x5d0\\n   kvm_arch_vcpu_ioctl_run+0xd81/0x1c70\\n   kvm_vcpu_ioctl+0x267/0x670\\n   __x64_sys_ioctl+0x83/0xa0\\n   do_syscall_64+0x56/0x80\\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/secretmem: corrige la p\u00e1gina NULL-\u0026gt;desreferencia de mapeo en page_is_secretmem() Verifique si hay una p\u00e1gina NULL-\u0026gt;mapping antes de desreferenciar el mapeo en page_is_secretmem(), ya que el mapeo de la p\u00e1gina puede ser anulado mientras se ejecuta gup(), por ejemplo, mediante recuperaci\u00f3n o truncamiento. ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 00000000000000068 #PF: acceso de lectura del supervisor en modo kernel #PF: c\u00f3digo_error(0x0000) - p\u00e1gina no presente PGD 0 P4D 0 Ups: 0000 [#1] PREEMPT SMP NOPTI CPU: 6 PID: 4173897 Comunicaciones: CPU 3/KVM contaminada: GW RIP: 0010:internal_get_user_pages_fast+0x621/0x9d0 C\u00f3digo: \u0026lt;48\u0026gt; 81 7a 68 80 08 04 bc 0f 85 21 ff ff 8 89 c7 be RSP: ffffaa90087679 b0 EFLAGS: 00010046 RAX: ffffe3f37905b900 RBX: 00007f2dd561e000 RCX: ffffe3f37905b934 RDX: 0000000000000000 RSI: 00000000000000000 RDI: ffffe3f37905b900 ... CR2: 0000068 CR3: 00000004c5898003 CR4: 00000000001726e0 Seguimiento de llamadas: get_user_pages_fast_only+0x13/0x20 hva_to_pfn+0xa9/0x3e0 try_async_pf+0xa1/0x270 direct_page_fault+0x113/ 0xad0 kvm_mmu_page_fault+0x69/0x680 vmx_handle_exit+0xe1/0x5d0 kvm_arch_vcpu_ioctl_run+0xd81/0x1c70 kvm_vcpu_ioctl+0x267/0x670 __x64_sys_ioctl+0x83/0xa0 scall_64+0x56/0x80 entrada_SYSCALL_64_after_hwframe+0x44/0xae\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"include/linux/secretmem.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1507f51255c9ff07d75909a84e7c0d7f3c4b2f49\",\"lessThan\":\"b77ba1e02345bafd703f0d407bdbd88c3be1f767\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1507f51255c9ff07d75909a84e7c0d7f3c4b2f49\",\"lessThan\":\"79f9bc5843142b649575f887dccdf1c07ad75c20\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"include/linux/secretmem.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.14.15\",\"lessThanOrEqual\":\"5.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15\",\"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\":\"2024-05-22T17:54:35.234529Z\",\"id\":\"CVE-2021-47463\",\"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\":\"5.14\",\"versionEndExcluding\":\"5.14.15\",\"matchCriteriaId\":\"7B0C1B4E-5CC9-4DDA-BCEF-02A0A22BBE53\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"E46C74C6-B76B-4C94-A6A4-FD2FFF62D644\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"60134C3A-06E4-48C1-B04F-2903732A4E56\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"0460DA88-8FE1-46A2-9DDA-1F1ABA552E71\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"AF55383D-4DF2-45DC-93F7-571F4F978EAB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"9E9481B2-8AA6-4CBD-B5D3-C10F51FF6D01\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"EBD45831-4B79-42BC-ABC0-86870F0DEA89\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/79f9bc5843142b649575f887dccdf1c07ad75c20\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b77ba1e02345bafd703f0d407bdbd88c3be1f767\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/79f9bc5843142b649575f887dccdf1c07ad75c20\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b77ba1e02345bafd703f0d407bdbd88c3be1f767\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T14:01:53+00:00",
      "cve": "CVE-2021-47463",
      "id": "CVE-2021-47463",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm/secretmem: fix NULL page--\u003emapping dereference in page_is_secretmem()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47463.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-02T02:17:40Z",
      "cve": "CVE-2021-47463",
      "id": "CVE-2021-47463",
      "initial_release_date": "2024-05-23T15:55:43Z",
      "product_status:known_affected": "275",
      "product_status:known_not_affected": "266",
      "product_status:recommended": "452",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47463",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47463.json",
      "version": "54"
    },
    "vulnrichment": {
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      "cveMetadata": "{\"cveId\": \"CVE-2021-47463\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T13:55:12.642Z\", \"dateReserved\": \"2024-05-22T06:20:56.198Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-22T06:23:23.688Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.