{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53051", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.381Z", "datePublished": "2026-06-24T16:29:56.949Z", "dateUpdated": "2026-06-24T16:29:56.949Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-06-24T16:29:56.949Z"}, "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/pci/controller/dwc/pcie-tegra194.c"], "versions": [{"version": "72034050ccf4202cd6558b0afd2474f756ea3b9b", "lessThan": "010983063a806720b45778d191335f8ea864fea3", "status": "affected", "versionType": "git"}, {"version": "40e2125381dc11379112485e3eefdd25c6df5375", "lessThan": "b059a41bdd5b202b2b9d7708403fb43c69689e53", "status": "affected", "versionType": "git"}, {"version": "40e2125381dc11379112485e3eefdd25c6df5375", "lessThan": "ce899f9c019591b73ef84b9afa332ed53beece25", "status": "affected", "versionType": "git"}, {"version": "40e2125381dc11379112485e3eefdd25c6df5375", "lessThan": "34b3eef48d980cd37b876e128bbf314f69fb5d70", "status": "affected", "versionType": "git"}, {"version": "70212c2300971506e986d95000d2745529cac9d7", "status": "affected", "versionType": "git"}, {"version": "6.12.2", "lessThan": "6.12.91", "status": "affected", "versionType": "semver"}, {"version": "6.11.11", "lessThan": "6.12", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/pci/controller/dwc/pcie-tegra194.c"], "versions": [{"version": "6.13", "status": "affected"}, {"version": "0", "lessThan": "6.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.2", "versionEndExcluding": "6.12.91"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.33"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.0.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11.11"}]}]}], "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"}}}}

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{"bugzilla": {"description": "kernel: PCI: tegra194: Fix CBB timeout caused by DBI access before core power-on", "id": "2492407", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492407"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-367", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nPCI: tegra194: Fix CBB timeout caused by DBI access before core power-on\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.\nThe call chain that causes the timeout:\npex_ep_event_pex_rst_deassert()\npci_epc_deinit_notify()\npci_epf_test_epc_deinit()\npci_epf_test_clear_bar()\npci_epc_clear_bar()\ndw_pcie_ep_clear_bar()\n__dw_pcie_ep_reset_bar()\ndw_pcie_dbi_ro_wr_en() <- Accesses 0x8bc DBI register\nreset_control_deassert(pcie->core_rst) <- Core powered on HERE\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.\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.", "A flaw was found in the Linux kernel. During a specific hardware reset sequence, the system attempts to access hardware registers before the PCI Express controller is fully powered on. This premature access can cause a Control Backbone (CBB) timeout, leading to system unresponsiveness. This issue can result in a Denial of Service (DoS)."], "name": "CVE-2026-53051", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53051\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53051\nhttps://lore.kernel.org/linux-cve-announce/2026062459-CVE-2026-53051-c446@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[72034050ccf4202cd6558b0afd2474f756ea3b9b,010983063a806720b45778d191335f8ea864fea3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[40e2125381dc11379112485e3eefdd25c6df5375,b059a41bdd5b202b2b9d7708403fb43c69689e53)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[40e2125381dc11379112485e3eefdd25c6df5375,ce899f9c019591b73ef84b9afa332ed53beece25)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[40e2125381dc11379112485e3eefdd25c6df5375,34b3eef48d980cd37b876e128bbf314f69fb5d70)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "70212c2300971506e986d95000d2745529cac9d7"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.2,6.12.91)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.11.11,6.12)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.13"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.13)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.91,6.13)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.33,6.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.10,7.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-06-24T20:15:07.669530+00:00", "updated": "2026-06-27T05:00:12.358051+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}