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

Vulnerability from cvelistv5 – Published: 2025-02-26 02:12 – Updated: 2025-12-23 13:23
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 ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
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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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/pci/pci.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "4.13"
            },
            {
              "lessThan": "4.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.283",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.247",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.198",
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            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.121",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.46",
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              "lessThanOrEqual": "5.17.*",
              "status": "unaffected",
              "version": "5.17.14",
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              "version": "5.19",
              "versionType": "original_commit_for_fix"
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          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: Avoid pci_dev_lock() AB/BA deadlock with sriov_numvfs_store()\n\nThe sysfs sriov_numvfs_store() path acquires the device lock before the\nconfig space access lock:\n\n  sriov_numvfs_store\n    device_lock                 # A (1) acquire device lock\n    sriov_configure\n      vfio_pci_sriov_configure  # (for example)\n        vfio_pci_core_sriov_configure\n          pci_disable_sriov\n            sriov_disable\n              pci_cfg_access_lock\n                pci_wait_cfg    # B (4) wait for dev-\u003eblock_cfg_access == 0\n\nPreviously, pci_dev_lock() acquired the config space access lock before the\ndevice lock:\n\n  pci_dev_lock\n    pci_cfg_access_lock\n      dev-\u003eblock_cfg_access = 1 # B (2) set dev-\u003eblock_cfg_access = 1\n    device_lock                 # A (3) wait for device lock\n\nAny path that uses pci_dev_lock(), e.g., pci_reset_function(), may\ndeadlock with sriov_numvfs_store() if the operations occur in the sequence\n(1) (2) (3) (4).\n\nAvoid the deadlock by reversing the order in pci_dev_lock() so it acquires\nthe device lock before the config space access lock, the same as the\nsriov_numvfs_store() path.\n\n[bhelgaas: combined and adapted commit log from Jay Zhou\u0027s independent\nsubsequent posting:\nhttps://lore.kernel.org/r/20220404062539.1710-1-jianjay.zhou@huawei.com]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-23T13:23:58.869Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c3c6dc1853b8bf3c718f96fd8480a6eb09ba4831"
        },
        {
          "url": "https://git.kernel.org/stable/c/aed6d4d519210c28817948f34c53b6e058e0456c"
        },
        {
          "url": "https://git.kernel.org/stable/c/c9a81f9ed6ae3554621d6a50220b1bc74b67d81e"
        },
        {
          "url": "https://git.kernel.org/stable/c/eff3587b9c01439b738298475e555c028ac9f55e"
        },
        {
          "url": "https://git.kernel.org/stable/c/2cdd5284035322795b0964f899eefba254cfe483"
        },
        {
          "url": "https://git.kernel.org/stable/c/ea047f51172aa68841adef7f52d375002438b8f0"
        },
        {
          "url": "https://git.kernel.org/stable/c/59ea6b3ae51df7cd6bfd84c9c0030609b9315622"
        },
        {
          "url": "https://git.kernel.org/stable/c/a91ee0e9fca9d7501286cfbced9b30a33e52740a"
        }
      ],
      "title": "PCI: Avoid pci_dev_lock() AB/BA deadlock with sriov_numvfs_store()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49434",
    "datePublished": "2025-02-26T02:12:51.068Z",
    "dateReserved": "2025-02-26T02:08:31.570Z",
    "dateUpdated": "2025-12-23T13:23:58.869Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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