{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47333", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-21T14:28:16.975Z", "datePublished": "2024-05-21T14:35:43.760Z", "dateUpdated": "2026-05-11T13:52:36.036Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T13:52:36.036Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: alcor_pci: fix null-ptr-deref when there is no PCI bridge\n\nThere is an issue with the ASPM(optional) capability checking function.\nA device might be attached to root complex directly, in this case,\nbus->self(bridge) will be NULL, thus priv->parent_pdev is NULL.\nSince alcor_pci_init_check_aspm(priv->parent_pdev) checks the PCI link's\nASPM capability and populate parent_cap_off, 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ASPM for the device.\n\n[ 1.246492] BUG: kernel NULL pointer dereference, address: 00000000000000c0\n[ 1.248731] RIP: 0010:pci_read_config_byte+0x5/0x40\n[ 1.253998] Call Trace:\n[ 1.254131] ? alcor_pci_find_cap_offset.isra.0+0x3a/0x100 [alcor_pci]\n[ 1.254476] alcor_pci_probe+0x169/0x2d5 [alcor_pci]"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.134", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.52", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.12.19", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.13.4", "versionStartIncluding": "5.0"}, {"criteria": 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Hay un problema con la funci\u00f3n de verificaci\u00f3n de capacidad ASPM (opcional). Un dispositivo se puede conectar directamente al complejo root; en este caso, bus->self(bridge) ser\u00e1 NULL, por lo tanto, priv->parent_pdev es NULL. Dado que alcor_pci_init_check_aspm(priv->parent_pdev) verifica la capacidad ASPM del enlace PCI y completa parent_cap_off, que ser\u00e1 utilizado m\u00e1s adelante por alcor_pci_aspm_ctrl() para encender/apagar din\u00e1micamente el dispositivo, lo que podemos hacer aqu\u00ed es evitar verificar la capacidad si estamos encendidos. el complejo ra\u00edz. Esto har\u00e1 que pdev_cap_off sea 0 y alcor_pci_aspm_ctrl() simplemente regrese cuando se llame a Bring, deshabilitando efectivamente ASPM para el dispositivo. [1.246492] BUG: desreferencia del puntero NULL del kernel, direcci\u00f3n: 00000000000000c0 [1.248731] RIP: 0010:pci_read_config_byte+0x5/0x40 [1.253998] Seguimiento de llamadas: [1.254131]? alcor_pci_find_cap_offset.isra.0+0x3a/0x100 [alcor_pci] [ 1.254476] alcor_pci_probe+0x169/0x2d5 [alcor_pci]"}], "id": "CVE-2021-47333", "lastModified": "2025-04-02T14:32:09.983", "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2024-05-21T15:15:20.200", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/09d154990ca82d14aed2b72796f6c8845e2e605d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3ce3e45cc333da707d4d6eb433574b990bcc26f5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/58f69684ba03e5b0e0a3ae844a845280c0f06309"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/717cf5ae52322ddbdf3ac2c584b34c5970b0d174"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d2639ffdcad463b358b6bef8645ff81715daffcb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/09d154990ca82d14aed2b72796f6c8845e2e605d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3ce3e45cc333da707d4d6eb433574b990bcc26f5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/58f69684ba03e5b0e0a3ae844a845280c0f06309"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/717cf5ae52322ddbdf3ac2c584b34c5970b0d174"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d2639ffdcad463b358b6bef8645ff81715daffcb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: misc: alcor_pci: fix null-ptr-deref when there is no PCI bridge", "id": "2282427", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282427"}, "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:\nmisc: alcor_pci: fix null-ptr-deref when there is no PCI bridge\nThere is an issue with the ASPM(optional) capability checking function.\nA device might be attached to root complex directly, in this case,\nbus->self(bridge) will be NULL, thus priv->parent_pdev is NULL.\nSince alcor_pci_init_check_aspm(priv->parent_pdev) checks the PCI link's\nASPM capability and populate parent_cap_off, which will be used later by\nalcor_pci_aspm_ctrl() to dynamically turn on/off device, what we can do\nhere is to avoid checking the capability if we are on the root complex.\nThis will make pdev_cap_off 0 and alcor_pci_aspm_ctrl() will simply\nreturn when bring called, effectively disable ASPM for the device.\n[ 1.246492] BUG: kernel NULL pointer dereference, address: 00000000000000c0\n[ 1.248731] RIP: 0010:pci_read_config_byte+0x5/0x40\n[ 1.253998] Call Trace:\n[ 1.254131] ? alcor_pci_find_cap_offset.isra.0+0x3a/0x100 [alcor_pci]\n[ 1.254476] alcor_pci_probe+0x169/0x2d5 [alcor_pci]"], "name": "CVE-2021-47333", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "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": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47333\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47333"], "threat_severity": "Low"}

{}