CVE-2026-53051 (GCVE-0-2026-53051)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-24 16:29
VLAI
Title
PCI: tegra194: Fix CBB timeout caused by DBI access before core power-on
Summary
In the Linux kernel, the following vulnerability has been resolved: PCI: tegra194: Fix CBB timeout caused by DBI access before core power-on When PERST# is deasserted twice (assert -> deassert -> assert -> deassert), a CBB (Control Backbone) timeout occurs at DBI register offset 0x8bc (PCIE_MISC_CONTROL_1_OFF). This happens because pci_epc_deinit_notify() and dw_pcie_ep_cleanup() are called before reset_control_deassert() powers on the controller core. The call chain that causes the timeout: pex_ep_event_pex_rst_deassert() pci_epc_deinit_notify() pci_epf_test_epc_deinit() pci_epf_test_clear_bar() pci_epc_clear_bar() dw_pcie_ep_clear_bar() __dw_pcie_ep_reset_bar() dw_pcie_dbi_ro_wr_en() <- Accesses 0x8bc DBI register reset_control_deassert(pcie->core_rst) <- Core powered on HERE The DBI registers, including PCIE_MISC_CONTROL_1_OFF (0x8bc), are only accessible after the controller core is powered on via reset_control_deassert(pcie->core_rst). Accessing them before this point results in a CBB timeout because the hardware is not yet operational. Fix this by moving pci_epc_deinit_notify() and dw_pcie_ep_cleanup() to after reset_control_deassert(pcie->core_rst), ensuring the controller is fully powered on before any DBI register accesses occur.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 72034050ccf4202cd6558b0afd2474f756ea3b9b , < 010983063a806720b45778d191335f8ea864fea3 (git)
Affected: 40e2125381dc11379112485e3eefdd25c6df5375 , < b059a41bdd5b202b2b9d7708403fb43c69689e53 (git)
Affected: 40e2125381dc11379112485e3eefdd25c6df5375 , < ce899f9c019591b73ef84b9afa332ed53beece25 (git)
Affected: 40e2125381dc11379112485e3eefdd25c6df5375 , < 34b3eef48d980cd37b876e128bbf314f69fb5d70 (git)
Affected: 70212c2300971506e986d95000d2745529cac9d7 (git)
Affected: 6.12.2 , < 6.12.91 (semver)
Affected: 6.11.11 , < 6.12 (semver)
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Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/pci/controller/dwc/pcie-tegra194.c"
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          "product": "Linux",
          "programFiles": [
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          "vendor": "Linux",
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              "status": "unaffected",
              "version": "7.0.10",
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              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: tegra194: Fix CBB timeout caused by DBI access before core power-on\n\nWhen PERST# is deasserted twice (assert -\u003e deassert -\u003e assert -\u003e deassert),\na CBB (Control Backbone) timeout occurs at DBI register offset 0x8bc\n(PCIE_MISC_CONTROL_1_OFF). This happens because pci_epc_deinit_notify()\nand dw_pcie_ep_cleanup() are called before reset_control_deassert() powers\non the controller core.\n\nThe call chain that causes the timeout:\n\n  pex_ep_event_pex_rst_deassert()\n    pci_epc_deinit_notify()\n      pci_epf_test_epc_deinit()\n        pci_epf_test_clear_bar()\n          pci_epc_clear_bar()\n            dw_pcie_ep_clear_bar()\n              __dw_pcie_ep_reset_bar()\n                dw_pcie_dbi_ro_wr_en()      \u003c- Accesses 0x8bc DBI register\n    reset_control_deassert(pcie-\u003ecore_rst)  \u003c- Core powered on HERE\n\nThe DBI registers, including PCIE_MISC_CONTROL_1_OFF (0x8bc), are only\naccessible after the controller core is powered on via\nreset_control_deassert(pcie-\u003ecore_rst). Accessing them before this point\nresults in a CBB timeout because the hardware is not yet operational.\n\nFix this by moving pci_epc_deinit_notify() and dw_pcie_ep_cleanup() to\nafter reset_control_deassert(pcie-\u003ecore_rst), ensuring the controller is\nfully powered on before any DBI register accesses occur."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T16:29:56.949Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/010983063a806720b45778d191335f8ea864fea3"
        },
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          "url": "https://git.kernel.org/stable/c/b059a41bdd5b202b2b9d7708403fb43c69689e53"
        },
        {
          "url": "https://git.kernel.org/stable/c/ce899f9c019591b73ef84b9afa332ed53beece25"
        },
        {
          "url": "https://git.kernel.org/stable/c/34b3eef48d980cd37b876e128bbf314f69fb5d70"
        }
      ],
      "title": "PCI: tegra194: Fix CBB timeout caused by DBI access before core power-on",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53051",
    "datePublished": "2026-06-24T16:29:56.949Z",
    "dateReserved": "2026-06-09T07:44:35.381Z",
    "dateUpdated": "2026-06-24T16:29:56.949Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-53051",
      "date": "2026-07-02",
      "epss": "0.00175",
      "percentile": "0.0723"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53051\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-24T17:17:17.083\",\"lastModified\":\"2026-06-24T17:17:17.083\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nPCI: tegra194: Fix CBB timeout caused by DBI access before core power-on\\n\\nWhen PERST# is deasserted twice (assert -\u003e deassert -\u003e assert -\u003e deassert),\\na CBB (Control Backbone) timeout occurs at DBI register offset 0x8bc\\n(PCIE_MISC_CONTROL_1_OFF). This happens because pci_epc_deinit_notify()\\nand dw_pcie_ep_cleanup() are called before reset_control_deassert() powers\\non the controller core.\\n\\nThe call chain that causes the timeout:\\n\\n  pex_ep_event_pex_rst_deassert()\\n    pci_epc_deinit_notify()\\n      pci_epf_test_epc_deinit()\\n        pci_epf_test_clear_bar()\\n          pci_epc_clear_bar()\\n            dw_pcie_ep_clear_bar()\\n              __dw_pcie_ep_reset_bar()\\n                dw_pcie_dbi_ro_wr_en()      \u003c- Accesses 0x8bc DBI register\\n    reset_control_deassert(pcie-\u003ecore_rst)  \u003c- Core powered on HERE\\n\\nThe DBI registers, including PCIE_MISC_CONTROL_1_OFF (0x8bc), are only\\naccessible after the controller core is powered on via\\nreset_control_deassert(pcie-\u003ecore_rst). Accessing them before this point\\nresults in a CBB timeout because the hardware is not yet operational.\\n\\nFix this by moving pci_epc_deinit_notify() and dw_pcie_ep_cleanup() to\\nafter reset_control_deassert(pcie-\u003ecore_rst), ensuring the controller is\\nfully powered on before any DBI register accesses occur.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/pci/controller/dwc/pcie-tegra194.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"72034050ccf4202cd6558b0afd2474f756ea3b9b\",\"lessThan\":\"010983063a806720b45778d191335f8ea864fea3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"40e2125381dc11379112485e3eefdd25c6df5375\",\"lessThan\":\"b059a41bdd5b202b2b9d7708403fb43c69689e53\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"40e2125381dc11379112485e3eefdd25c6df5375\",\"lessThan\":\"ce899f9c019591b73ef84b9afa332ed53beece25\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"40e2125381dc11379112485e3eefdd25c6df5375\",\"lessThan\":\"34b3eef48d980cd37b876e128bbf314f69fb5d70\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"70212c2300971506e986d95000d2745529cac9d7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.12.2\",\"lessThan\":\"6.12.91\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.11.11\",\"lessThan\":\"6.12\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/pci/controller/dwc/pcie-tegra194.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.13\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.13\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.91\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/010983063a806720b45778d191335f8ea864fea3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/34b3eef48d980cd37b876e128bbf314f69fb5d70\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b059a41bdd5b202b2b9d7708403fb43c69689e53\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ce899f9c019591b73ef84b9afa332ed53beece25\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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