{"api_version":"1","generated_at":"2026-06-25T12:27:28+00:00","cve":"CVE-2026-53051","urls":{"html":"https://cve.report/CVE-2026-53051","api":"https://cve.report/api/cve/CVE-2026-53051.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53051","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53051"},"summary":{"title":"PCI: tegra194: Fix CBB timeout caused by DBI access before core power-on","description":"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 -> deassert -> assert -> 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()      <- Accesses 0x8bc DBI register\n    reset_control_deassert(pcie->core_rst)  <- 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->core_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->core_rst), ensuring the controller is\nfully powered on before any DBI register accesses occur.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-24 17:17:17","updated_at":"2026-06-24 17:17:17"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/34b3eef48d980cd37b876e128bbf314f69fb5d70","name":"https://git.kernel.org/stable/c/34b3eef48d980cd37b876e128bbf314f69fb5d70","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b059a41bdd5b202b2b9d7708403fb43c69689e53","name":"https://git.kernel.org/stable/c/b059a41bdd5b202b2b9d7708403fb43c69689e53","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ce899f9c019591b73ef84b9afa332ed53beece25","name":"https://git.kernel.org/stable/c/ce899f9c019591b73ef84b9afa332ed53beece25","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/010983063a806720b45778d191335f8ea864fea3","name":"https://git.kernel.org/stable/c/010983063a806720b45778d191335f8ea864fea3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53051","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53051","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 72034050ccf4202cd6558b0afd2474f756ea3b9b 010983063a806720b45778d191335f8ea864fea3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 40e2125381dc11379112485e3eefdd25c6df5375 b059a41bdd5b202b2b9d7708403fb43c69689e53 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 40e2125381dc11379112485e3eefdd25c6df5375 ce899f9c019591b73ef84b9afa332ed53beece25 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 40e2125381dc11379112485e3eefdd25c6df5375 34b3eef48d980cd37b876e128bbf314f69fb5d70 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 70212c2300971506e986d95000d2745529cac9d7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.2 6.12.91 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.11.11 6.12 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.13","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.13 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.91 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.33 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.10 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/pci/controller/dwc/pcie-tegra194.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"010983063a806720b45778d191335f8ea864fea3","status":"affected","version":"72034050ccf4202cd6558b0afd2474f756ea3b9b","versionType":"git"},{"lessThan":"b059a41bdd5b202b2b9d7708403fb43c69689e53","status":"affected","version":"40e2125381dc11379112485e3eefdd25c6df5375","versionType":"git"},{"lessThan":"ce899f9c019591b73ef84b9afa332ed53beece25","status":"affected","version":"40e2125381dc11379112485e3eefdd25c6df5375","versionType":"git"},{"lessThan":"34b3eef48d980cd37b876e128bbf314f69fb5d70","status":"affected","version":"40e2125381dc11379112485e3eefdd25c6df5375","versionType":"git"},{"status":"affected","version":"70212c2300971506e986d95000d2745529cac9d7","versionType":"git"},{"lessThan":"6.12.91","status":"affected","version":"6.12.2","versionType":"semver"},{"lessThan":"6.12","status":"affected","version":"6.11.11","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/pci/controller/dwc/pcie-tegra194.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.13"},{"lessThan":"6.13","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.91","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.33","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.91","versionStartIncluding":"6.12.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.33","versionStartIncluding":"6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.10","versionStartIncluding":"6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11.11","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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 -> deassert -> assert -> 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()      <- Accesses 0x8bc DBI register\n    reset_control_deassert(pcie->core_rst)  <- 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->core_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->core_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"},"references":[{"url":"https://git.kernel.org/stable/c/010983063a806720b45778d191335f8ea864fea3"},{"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","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","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"},"nvd":{"publishedDate":"2026-06-24 17:17:17","lastModifiedDate":"2026-06-24 17:17:17","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"53051","Ordinal":"1","Title":"PCI: tegra194: Fix CBB timeout caused by DBI access before core ","CVE":"CVE-2026-53051","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"53051","Ordinal":"1","NoteData":"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 -> deassert -> assert -> 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()      <- Accesses 0x8bc DBI register\n    reset_control_deassert(pcie->core_rst)  <- 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->core_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->core_rst), ensuring the controller is\nfully powered on before any DBI register accesses occur.","Type":"Description","Title":"PCI: tegra194: Fix CBB timeout caused by DBI access before core "}]}}}