CVE-2026-53051
PCI: tegra194: Fix CBB timeout caused by DBI access before core power-on
Description
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.
INFO
Published Date :
June 24, 2026, 5:17 p.m.
Last Modified :
July 21, 2026, 5:23 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Ensure controller core power-on before DBI access.
- Move deinitialization calls after power-on.
- Update PCI driver logic for proper reset handling.
References to Advisories, Solutions, and Tools
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CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
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associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
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stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-53051
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2026-53051 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53051 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 21, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.11.11 up to (excluding) 6.12 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.33 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.12.2 up to (excluding) 6.12.91 Added Reference Type kernel.org: https://git.kernel.org/stable/c/010983063a806720b45778d191335f8ea864fea3 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/34b3eef48d980cd37b876e128bbf314f69fb5d70 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b059a41bdd5b202b2b9d7708403fb43c69689e53 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ce899f9c019591b73ef84b9afa332ed53beece25 Types: Patch -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 24, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', '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'}], 'programFiles': ['drivers/pci/controller/dwc/pcie-tegra194.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.13'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.13', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.91', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.33', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.10', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/pci/controller/dwc/pcie-tegra194.c'], 'defaultStatus': 'affected'}] Added Description 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. Added Reference https://git.kernel.org/stable/c/010983063a806720b45778d191335f8ea864fea3 Added Reference https://git.kernel.org/stable/c/34b3eef48d980cd37b876e128bbf314f69fb5d70 Added Reference https://git.kernel.org/stable/c/b059a41bdd5b202b2b9d7708403fb43c69689e53 Added Reference https://git.kernel.org/stable/c/ce899f9c019591b73ef84b9afa332ed53beece25