CVE-2021-47333 (GCVE-0-2021-47333)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-05-11 13:52
VLAI
Title
misc: alcor_pci: fix null-ptr-deref when there is no PCI bridge
Summary
In the Linux kernel, the following vulnerability has been resolved: misc: alcor_pci: fix null-ptr-deref when there is no PCI bridge There is an issue with the ASPM(optional) capability checking function. A device might be attached to root complex directly, in this case, bus->self(bridge) will be NULL, thus priv->parent_pdev is NULL. Since alcor_pci_init_check_aspm(priv->parent_pdev) checks the PCI link's ASPM capability and populate parent_cap_off, which will be used later by alcor_pci_aspm_ctrl() to dynamically turn on/off device, what we can do here is to avoid checking the capability if we are on the root complex. This will make pdev_cap_off 0 and alcor_pci_aspm_ctrl() will simply return when bring called, effectively disable ASPM for the device. [ 1.246492] BUG: kernel NULL pointer dereference, address: 00000000000000c0 [ 1.248731] RIP: 0010:pci_read_config_byte+0x5/0x40 [ 1.253998] Call Trace: [ 1.254131] ? alcor_pci_find_cap_offset.isra.0+0x3a/0x100 [alcor_pci] [ 1.254476] alcor_pci_probe+0x169/0x2d5 [alcor_pci]
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-29 18:10 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d , < d2639ffdcad463b358b6bef8645ff81715daffcb (git)
Affected: 4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d , < 58f69684ba03e5b0e0a3ae844a845280c0f06309 (git)
Affected: 4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d , < 717cf5ae52322ddbdf3ac2c584b34c5970b0d174 (git)
Affected: 4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d , < 09d154990ca82d14aed2b72796f6c8845e2e605d (git)
Affected: 4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d , < 3ce3e45cc333da707d4d6eb433574b990bcc26f5 (git)
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Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 5.4.134 , ≤ 5.4.* (semver)
Unaffected: 5.10.52 , ≤ 5.10.* (semver)
Unaffected: 5.12.19 , ≤ 5.12.* (semver)
Unaffected: 5.13.4 , ≤ 5.13.* (semver)
Unaffected: 5.14 , ≤ * (original_commit_for_fix)
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        "cveTags": [],
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            "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-\u003eself(bridge) will be NULL, thus priv-\u003eparent_pdev is NULL.\nSince alcor_pci_init_check_aspm(priv-\u003eparent_pdev) checks the PCI link\u0027s\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\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]"
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            "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: misc: alcor_pci: corrige null-ptr-deref cuando no hay un puente PCI. 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-\u0026gt;self(bridge) ser\u00e1 NULL, por lo tanto, priv-\u0026gt;parent_pdev es NULL. Dado que alcor_pci_init_check_aspm(priv-\u0026gt;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]"
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      "product_status:known_affected": "90",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: misc: alcor_pci: fix null-ptr-deref when there is no PCI bridge",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47333.json",
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      "current_release_date": "2026-09-15T02:31:14Z",
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      "product_status:known_not_affected": "314",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47333",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47333.json",
      "version": "45"
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        "datePublished": "2024-05-21T14:35:43.760Z",
        "dateReserved": "2024-05-21T14:28:16.975Z",
        "dateUpdated": "2025-12-18T11:36:55.223Z",
        "state": "PUBLISHED"
      },
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  }
}



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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

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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.



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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.