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CVE-2022-49434 (GCVE-0-2022-49434)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:12 – Updated: 2026-05-11 18:59
VLAI
Title
PCI: Avoid pci_dev_lock() AB/BA deadlock with sriov_numvfs_store()
Summary
In the Linux kernel, the following vulnerability has been resolved: PCI: Avoid pci_dev_lock() AB/BA deadlock with sriov_numvfs_store() The sysfs sriov_numvfs_store() path acquires the device lock before the config space access lock: sriov_numvfs_store device_lock # A (1) acquire device lock sriov_configure vfio_pci_sriov_configure # (for example) vfio_pci_core_sriov_configure pci_disable_sriov sriov_disable pci_cfg_access_lock pci_wait_cfg # B (4) wait for dev->block_cfg_access == 0 Previously, pci_dev_lock() acquired the config space access lock before the device lock: pci_dev_lock pci_cfg_access_lock dev->block_cfg_access = 1 # B (2) set dev->block_cfg_access = 1 device_lock # A (3) wait for device lock Any path that uses pci_dev_lock(), e.g., pci_reset_function(), may deadlock with sriov_numvfs_store() if the operations occur in the sequence (1) (2) (3) (4). Avoid the deadlock by reversing the order in pci_dev_lock() so it acquires the device lock before the config space access lock, the same as the sriov_numvfs_store() path. [bhelgaas: combined and adapted commit log from Jay Zhou's independent subsequent posting: https://lore.kernel.org/r/20220404062539.1710-1-jianjay.zhou@huawei.com]
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e , < c3c6dc1853b8bf3c718f96fd8480a6eb09ba4831 (git)
Affected: 17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e , < aed6d4d519210c28817948f34c53b6e058e0456c (git)
Affected: 17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e , < c9a81f9ed6ae3554621d6a50220b1bc74b67d81e (git)
Affected: 17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e , < eff3587b9c01439b738298475e555c028ac9f55e (git)
Affected: 17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e , < 2cdd5284035322795b0964f899eefba254cfe483 (git)
Affected: 17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e , < ea047f51172aa68841adef7f52d375002438b8f0 (git)
Affected: 17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e , < 59ea6b3ae51df7cd6bfd84c9c0030609b9315622 (git)
Affected: 17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e , < a91ee0e9fca9d7501286cfbced9b30a33e52740a (git)
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Linux Linux Affected: 4.13
Unaffected: 0 , < 4.13 (semver)
Unaffected: 4.14.283 , ≤ 4.14.* (semver)
Unaffected: 4.19.247 , ≤ 4.19.* (semver)
Unaffected: 5.4.198 , ≤ 5.4.* (semver)
Unaffected: 5.10.121 , ≤ 5.10.* (semver)
Unaffected: 5.15.46 , ≤ 5.15.* (semver)
Unaffected: 5.17.14 , ≤ 5.17.* (semver)
Unaffected: 5.18.3 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
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          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: PCI: evitar el bloqueo AB/BA de pci_dev_lock() con sriov_numvfs_store() La ruta sysfs sriov_numvfs_store() adquiere el bloqueo del dispositivo antes del bloqueo de acceso al espacio de configuraci\u00f3n: sriov_numvfs_store device_lock # A (1) adquirir bloqueo del dispositivo sriov_configure vfio_pci_sriov_configure # (por ejemplo) vfio_pci_core_sriov_configure pci_disable_sriov sriov_disable pci_cfg_access_lock pci_wait_cfg # B (4) esperar a que dev-\u0026gt;block_cfg_access == 0 Anteriormente, pci_dev_lock() adquir\u00eda el bloqueo de acceso al espacio de configuraci\u00f3n antes del bloqueo del dispositivo: pci_dev_lock pci_cfg_access_lock dev-\u0026gt;block_cfg_access = 1 # B (2) set dev-\u0026gt;block_cfg_access = 1 device_lock # A (3) esperar a que se bloquee el dispositivo Cualquier ruta que use pci_dev_lock(), p. ej., pci_reset_function(), puede bloquearse con sriov_numvfs_store() si las operaciones ocurren en la secuencia (1) (2) (3) (4). Evite el bloqueo invirtiendo el orden en pci_dev_lock() para que adquiera el bloqueo del dispositivo antes del bloqueo de acceso al espacio de configuraci\u00f3n, lo mismo que la ruta sriov_numvfs_store(). [bhelgaas: registro de confirmaci\u00f3n combinado y adaptado de la publicaci\u00f3n posterior independiente de Jay Zhou: https://lore.kernel.org/r/20220404062539.1710-1-jianjay.zhou@huawei.com]"
          }
        ],
        "id": "CVE-2022-49434",
        "lastModified": "2026-06-17T05:18:02.347",
        "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"
            }
          ]
        },
        "published": "2025-02-26T07:01:19.863",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/2cdd5284035322795b0964f899eefba254cfe483"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/59ea6b3ae51df7cd6bfd84c9c0030609b9315622"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/a91ee0e9fca9d7501286cfbced9b30a33e52740a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/aed6d4d519210c28817948f34c53b6e058e0456c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c3c6dc1853b8bf3c718f96fd8480a6eb09ba4831"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c9a81f9ed6ae3554621d6a50220b1bc74b67d81e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ea047f51172aa68841adef7f52d375002438b8f0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/eff3587b9c01439b738298475e555c028ac9f55e"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-667"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T21:07:07+00:00",
      "cve": "CVE-2022-49434",
      "id": "CVE-2022-49434",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "201",
      "product_status:known_affected": "112",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: PCI: Avoid pci_dev_lock() AB/BA deadlock with sriov_numvfs_store()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49434.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-29T02:28:08Z",
      "cve": "CVE-2022-49434",
      "id": "CVE-2022-49434",
      "initial_release_date": "2025-02-27T03:06:59Z",
      "product_status:known_affected": "524",
      "product_status:known_not_affected": "220",
      "product_status:recommended": "276",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49434",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49434.json",
      "version": "64"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

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.