CVE-2026-53051
- Source
- https://cve.org/CVERecord?id=CVE-2026-53051
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53051.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-53051
- Downstream
BELL (1)
DEBIAN (1)
openSUSE (1)
SUSE (5)
- Related
- Published
- 2026-06-24T16:29:56Z
- Modified
- 2026-10-08T02:51:04Z
- Summary
- PCI: tegra194: Fix CBB timeout caused by DBI access before core power-on
- Details
-
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.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53051.json" }- References
-
- https://git.kernel.org/stable/c/010983063a806720b45778d191335f8ea864fea3
- https://git.kernel.org/stable/c/34b3eef48d980cd37b876e128bbf314f69fb5d70
- https://git.kernel.org/stable/c/b059a41bdd5b202b2b9d7708403fb43c69689e53
- https://git.kernel.org/stable/c/ce899f9c019591b73ef84b9afa332ed53beece25
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53051.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-53051
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced72034050ccf4202cd6558b0afd2474f756ea3b9bFixed010983063a806720b45778d191335f8ea864fea3
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced40e2125381dc11379112485e3eefdd25c6df5375Fixedb059a41bdd5b202b2b9d7708403fb43c69689e53Fixedce899f9c019591b73ef84b9afa332ed53beece25Fixed34b3eef48d980cd37b876e128bbf314f69fb5d70
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.12.2Fixed6.12.91
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.11.11Fixed6.12
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced70212c2300971506e986d95000d2745529cac9d7