Bug 2492447 (CVE-2026-53073) - CVE-2026-53073 kernel: Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error
Summary: CVE-2026-53073 kernel: Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error
Keywords:
Status: NEW
Alias: CVE-2026-53073
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-24 18:12 UTC by OSIDB Bzimport
Modified: 2026-11-03 14:04 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:63128 0 None None None 2026-09-04 01:02:58 UTC
Red Hat Product Errata RHSA-2026:63129 0 None None None 2026-09-04 00:52:53 UTC
Red Hat Product Errata RHSA-2026:92362 0 None None None 2026-10-29 12:05:44 UTC
Red Hat Product Errata RHSA-2026:94109 0 None None None 2026-11-02 23:13:01 UTC
Red Hat Product Errata RHSA-2026:94438 0 None None None 2026-11-03 09:03:25 UTC
Red Hat Product Errata RHSA-2026:94477 0 None None None 2026-11-03 09:21:51 UTC
Red Hat Product Errata RHSA-2026:94558 0 None None None 2026-11-03 14:04:01 UTC

Description OSIDB Bzimport 2026-06-24 18:12:34 UTC 
In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error

When hci_register_dev() fails in hci_uart_register_dev()
HCI_UART_PROTO_INIT is not cleared before calling hu->proto->close(hu)
and setting hu->hdev to NULL. This means incoming UART data will reach
the protocol-specific recv handler in hci_uart_tty_receive() after
resources are freed.

Clear HCI_UART_PROTO_INIT with a write lock before calling
hu->proto->close() and setting hu->hdev to NULL. The write lock ensures
all active readers have completed and no new reader can enter the
protocol recv path before resources are freed.

This allows the protocol-specific recv functions to remove the
"HCI_UART_REGISTERED" guard without risking a null pointer dereference
if hci_register_dev() fails.
Comment 1 Mauro Matteo Cascella 2026-06-25 09:02:12 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062405-CVE-2026-53073-9692@gregkh/T
Comment 4 errata-xmlrpc 2026-09-04 00:52:52 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:63129 https://access.redhat.com/errata/RHSA-2026:63129
Comment 5 errata-xmlrpc 2026-09-04 01:02:57 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:63128 https://access.redhat.com/errata/RHSA-2026:63128
Comment 7 Jon Orris 2026-10-29 12:05:44 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:92362 https://access.redhat.com/errata/RHSA-2026:92362
Comment 8 Jon Orris 2026-11-02 23:13:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:94109 https://access.redhat.com/errata/RHSA-2026:94109
Comment 9 Jon Orris 2026-11-03 09:03:24 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:94438 https://access.redhat.com/errata/RHSA-2026:94438
Comment 10 Jon Orris 2026-11-03 09:21:50 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:94477 https://access.redhat.com/errata/RHSA-2026:94477
Comment 11 Jon Orris 2026-11-03 14:04:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:94558 https://access.redhat.com/errata/RHSA-2026:94558
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