CVE-2021-47463

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["include/linux/secretmem.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "b77ba1e02345bafd703f0d407bdbd88c3be1f767", "status": "affected", "version": "1507f51255c9ff07d75909a84e7c0d7f3c4b2f49", "versionType": "git"}, {"lessThan": "79f9bc5843142b649575f887dccdf1c07ad75c20", "status": "affected", "version": "1507f51255c9ff07d75909a84e7c0d7f3c4b2f49", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["include/linux/secretmem.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.14"}, {"lessThan": "5.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.14.*", "status": "unaffected", "version": "5.14.15", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.15", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7B0C1B4E-5CC9-4DDA-BCEF-02A0A22BBE53", "versionEndExcluding": "5.14.15", "versionStartIncluding": "5.14", "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", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/secretmem: fix NULL page->mapping dereference in page_is_secretmem()\n\nCheck for a NULL page->mapping before dereferencing the mapping in\npage_is_secretmem(), as the page's 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: <48> 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-&gt;desreferencia de mapeo en page_is_secretmem() Verifique si hay una p\u00e1gina NULL-&gt;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: &lt;48&gt; 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"}], "id": "CVE-2021-47463", "lastModified": "2026-06-17T04:17:31.997", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47463", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-22T17:54:35.234529Z", "version": "2.0.3"}}]}, "published": "2024-05-22T07:15:11.193", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "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": "af854a3a-2127-422b-91ae-364da2661108", "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"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mm/secretmem: fix NULL page-->mapping dereference in page_is_secretmem()", "id": "2282893", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282893"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmm/secretmem: fix NULL page->mapping dereference in page_is_secretmem()\nCheck for a NULL page->mapping before dereferencing the mapping in\npage_is_secretmem(), as the page's mapping can be nullified while gup()\nis running, e.g. by reclaim or truncation.\nBUG: kernel NULL pointer dereference, address: 0000000000000068\n#PF: supervisor read access in kernel mode\n#PF: error_code(0x0000) - not-present page\nPGD 0 P4D 0\nOops: 0000 [#1] PREEMPT SMP NOPTI\nCPU: 6 PID: 4173897 Comm: CPU 3/KVM Tainted: G W\nRIP: 0010:internal_get_user_pages_fast+0x621/0x9d0\nCode: <48> 81 7a 68 80 08 04 bc 0f 85 21 ff ff 8 89 c7 be\nRSP: 0018:ffffaa90087679b0 EFLAGS: 00010046\nRAX: ffffe3f37905b900 RBX: 00007f2dd561e000 RCX: ffffe3f37905b934\nRDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffe3f37905b900\n...\nCR2: 0000000000000068 CR3: 00000004c5898003 CR4: 00000000001726e0\nCall Trace:\nget_user_pages_fast_only+0x13/0x20\nhva_to_pfn+0xa9/0x3e0\ntry_async_pf+0xa1/0x270\ndirect_page_fault+0x113/0xad0\nkvm_mmu_page_fault+0x69/0x680\nvmx_handle_exit+0xe1/0x5d0\nkvm_arch_vcpu_ioctl_run+0xd81/0x1c70\nkvm_vcpu_ioctl+0x267/0x670\n__x64_sys_ioctl+0x83/0xa0\ndo_syscall_64+0x56/0x80\nentry_SYSCALL_64_after_hwframe+0x44/0xae"], "name": "CVE-2021-47463", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47463\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47463\nhttps://lore.kernel.org/linux-cve-announce/2024052226-CVE-2021-47463-c131@gregkh/T"], "threat_severity": "Moderate"}

{}