Linux aws: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix locking in hci_conn_request_evt() with HCI_PROTO_DEFER When… (CVE-2026-53072)
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix locking in hci_conn_request_evt() with HCI_PROTO_DEFER When protocol sets HCI_PROTO_DEFER, hci_conn_request_evt() calls hci_connect_cfm(conn) without hdev->lock. Generally hci_connect_cfm() assumes it is held, and if conn is deleted concurrently -> UAF. Only SCO and ISO set HCI_PROTO_DEFER and only for defer setup listen, and HCI_EV_CONN_REQUEST is not generated for ISO. In the non-deferred listening socket code paths, hci_connect_cfm(conn) is called with hdev->lock held. Fix by holding the lock.
AI Analysis
Technical Summary
The Linux kernel Bluetooth code had a locking flaw in the hci_conn_request_evt() function when handling connections with the HCI_PROTO_DEFER protocol. Specifically, hci_connect_cfm(conn) was invoked without holding the hdev->lock, which it normally assumes to be held. This could lead to a use-after-free if the connection object is deleted concurrently. The issue affects SCO and ISO protocols that set HCI_PROTO_DEFER for deferred setup listening. The fix involves holding the hdev->lock during the call to prevent concurrent deletion issues.
Potential Impact
If exploited, this vulnerability could lead to a use-after-free condition in the Bluetooth subsystem of the Linux kernel, potentially causing system instability or crashes. The vulnerability requires local access with high attack complexity and partial privileges. There are no known exploits in the wild at this time.
Mitigation Recommendations
A fix is available for this vulnerability. Users should update their Linux kernel versions to 5.15.0-1112.119~20.04.1 or later (and corresponding patched versions) as listed in the affected versions to remediate the issue. Since this is not a cloud service, manual patching is required. Check vendor advisories for the latest updates and apply official patches promptly.
Linux aws: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix locking in hci_conn_request_evt() with HCI_PROTO_DEFER When… (CVE-2026-53072)
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix locking in hci_conn_request_evt() with HCI_PROTO_DEFER When protocol sets HCI_PROTO_DEFER, hci_conn_request_evt() calls hci_connect_cfm(conn) without hdev->lock. Generally hci_connect_cfm() assumes it is held, and if conn is deleted concurrently -> UAF. Only SCO and ISO set HCI_PROTO_DEFER and only for defer setup listen, and HCI_EV_CONN_REQUEST is not generated for ISO. In the non-deferred listening socket code paths, hci_connect_cfm(conn) is called with hdev->lock held. Fix by holding the lock.
CVSS v3.1
Score 8.8high
Affected software
pkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email 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protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel Bluetooth code had a locking flaw in the hci_conn_request_evt() function when handling connections with the HCI_PROTO_DEFER protocol. Specifically, hci_connect_cfm(conn) was invoked without holding the hdev->lock, which it normally assumes to be held. This could lead to a use-after-free if the connection object is deleted concurrently. The issue affects SCO and ISO protocols that set HCI_PROTO_DEFER for deferred setup listening. The fix involves holding the hdev->lock during the call to prevent concurrent deletion issues.
Potential Impact
If exploited, this vulnerability could lead to a use-after-free condition in the Bluetooth subsystem of the Linux kernel, potentially causing system instability or crashes. The vulnerability requires local access with high attack complexity and partial privileges. There are no known exploits in the wild at this time.
Mitigation Recommendations
A fix is available for this vulnerability. Users should update their Linux kernel versions to 5.15.0-1112.119~20.04.1 or later (and corresponding patched versions) as listed in the affected versions to remediate the issue. Since this is not a cloud service, manual patching is required. Check vendor advisories for the latest updates and apply official patches promptly.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-53072
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 4.0
Threat ID: 6a5a013a91ae9bcd3f801af8
Added to database: 07/17/2026, 10:17:30 UTC
Last enriched: 07/30/2026, 21:23:20 UTC
Last updated: 07/31/2026, 21:28:55 UTC
Views: 2
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