CVE-2026-53073 - Vulnerability Details

- Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error

Description

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.

Published: 2026-06-24

Score: 7.0 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`a40f94f7caa8d3421b64f63ac31bc0f24c890f39`	affected	< ebb39b2d81731b83ee71a1ba6dd0291a57b5ac07
`9e5a0f5777162e503400c70c6ed25fbbe2d38799`	affected	< ed4033fb85ccaaf6c3983be3c7b037e48253d232
`80f14e9de6a43a0bd8194cad1003a3e6dcbc3984`	affected	< 356dee1bcac4d0d9152390561fa63331ebff211b
`02e1bcdfdf769974e7e9fa285e295cd9852e2a38`	affected	< a673cf6c4ac702cb79ac1f4d7fc4de763a6a3e40
`281782d2c6730241e300d630bb9f200d831ede71`	affected	< f4b69c35813c432973d340d3600c01de106ed474
`5df5dafc171b90d0b8d51547a82657cd5a1986c7`	affected	< 3daa5818e473ed60eb69d8b5c71b651909d28c5a
`5df5dafc171b90d0b8d51547a82657cd5a1986c7`	affected	< 194f029a4d7f739e44ebc1f473120187b4de5104
`5df5dafc171b90d0b8d51547a82657cd5a1986c7`	affected	< 68d39ea5e0adc9ecaea1ce8abd842ec972eb8718
`1dcf08fcff5ca529de6dc0395091f28854f4e54a`	affected	—
`8e5aff600539e5faea294d9612cca50220e602b8`	affected	—
`db7509fa110dd9b11134b75894677f30353b2c51`	affected	—
`5.10.237`	affected	< 5.10.258
`5.15.181`	affected	< 5.15.209
`6.1.135`	affected	< 6.1.175
`6.6.88`	affected	< 6.6.141
`6.12.24`	affected	< 6.12.91
`5.4.293`	affected	< 5.5
`6.13.12`	affected	< 6.14
`6.14.3`	affected	< 6.15

Linux

affected

Version	Status	Constraints
`6.15`	affected	—
`0`	unaffected	< 6.15
`5.10.258`	unaffected	≤ 5.10.*
`5.15.209`	unaffected	≤ 5.15.*
`6.1.175`	unaffected	≤ 6.1.*
`6.6.141`	unaffected	≤ 6.6.*
`6.12.91`	unaffected	≤ 6.12.*
`6.18.33`	unaffected	≤ 6.18.*
`7.0.10`	unaffected	≤ 7.0.*
`7.1`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[a40f94f7caa8d3421b64f63ac31bc0f24c890f39,ebb39b2d81731b83ee71a1ba6dd0291a57b5ac07)`	affected	code_commit	—
`[9e5a0f5777162e503400c70c6ed25fbbe2d38799,ed4033fb85ccaaf6c3983be3c7b037e48253d232)`	affected	code_commit	—
`[80f14e9de6a43a0bd8194cad1003a3e6dcbc3984,356dee1bcac4d0d9152390561fa63331ebff211b)`	affected	code_commit	—
`[02e1bcdfdf769974e7e9fa285e295cd9852e2a38,a673cf6c4ac702cb79ac1f4d7fc4de763a6a3e40)`	affected	code_commit	—
`[281782d2c6730241e300d630bb9f200d831ede71,f4b69c35813c432973d340d3600c01de106ed474)`	affected	code_commit	—
`[5df5dafc171b90d0b8d51547a82657cd5a1986c7,3daa5818e473ed60eb69d8b5c71b651909d28c5a)`	affected	code_commit	—
`[5df5dafc171b90d0b8d51547a82657cd5a1986c7,194f029a4d7f739e44ebc1f473120187b4de5104)`	affected	code_commit	—
`[5df5dafc171b90d0b8d51547a82657cd5a1986c7,68d39ea5e0adc9ecaea1ce8abd842ec972eb8718)`	affected	code_commit	—
`1dcf08fcff5ca529de6dc0395091f28854f4e54a`	affected	code_commit	—
`8e5aff600539e5faea294d9612cca50220e602b8`	affected	code_commit	—
`db7509fa110dd9b11134b75894677f30353b2c51`	affected	code_commit	—
`[5.10.237,5.10.258)`	affected	semver	—
`[5.15.181,5.15.209)`	affected	semver	—
`[6.1.135,6.1.175)`	affected	semver	—
`[6.6.88,6.6.141)`	affected	semver	—
`[6.12.24,6.12.91)`	affected	semver	—
`[5.4.293,5.5)`	affected	generic	—
`[6.13.12,6.14)`	affected	generic	—
`[6.14.3,6.15)`	affected	generic	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`6.15`	affected	semver	—
`[0,6.15)`	unaffected	semver	—
`[5.10.258,5.10.*]`	unaffected	generic	—
`[5.15.209,5.15.*]`	unaffected	generic	—
`[6.1.175,6.1.*]`	unaffected	generic	—
`[6.6.141,6.6.*]`	unaffected	generic	—
`[6.12.91,6.12.*]`	unaffected	generic	—
`[6.18.33,6.18.*]`	unaffected	generic	—
`[7.0.10,7.0.*]`	unaffected	generic	—
`[7.1,*]`	unaffected	generic	—

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Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00172.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/194f029a4d7f739e44ebc1f473120187b4de5104
https://git.kernel.org/stable/c/356dee1bcac4d0d9152390561fa63331ebff211b
https://git.kernel.org/stable/c/3daa5818e473ed60eb69d8b5c71b651909d28c5a
https://git.kernel.org/stable/c/68d39ea5e0adc9ecaea1ce8abd842ec972eb8718
https://git.kernel.org/stable/c/a673cf6c4ac702cb79ac1f4d7fc4de763a6a3e40
https://git.kernel.org/stable/c/ebb39b2d81731b83ee71a1ba6dd0291a57b5ac07
https://git.kernel.org/stable/c/ed4033fb85ccaaf6c3983be3c7b037e48253d232
https://git.kernel.org/stable/c/f4b69c35813c432973d340d3600c01de106ed474
https://lore.kernel.org/linux-cve-announce/2026062405-CVE-2026-53073-9692@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-53073
https://www.cve.org/CVERecord?id=CVE-2026-53073

History

Fri, 26 Jun 2026 00:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-825
References		https://lore.kernel.org/linux-cve-announce/2026062405-CVE-2026-53073-9692@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2026-53073 https://www.cve.org/CVERecord?id=CVE-2026-53073
Metrics	threat_severity `None`	cvssV3_1 `{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}` threat_severity `Moderate`

Wed, 24 Jun 2026 19:45:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-476

Wed, 24 Jun 2026 17:15:00 +0000

Type	Values Removed	Values Added
Description		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.
Title		Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/194f029a4d7f739e44ebc1f473120187b4de5104 https://git.kernel.org/stable/c/356dee1bcac4d0d9152390561fa63331ebff211b https://git.kernel.org/stable/c/3daa5818e473ed60eb69d8b5c71b651909d28c5a https://git.kernel.org/stable/c/68d39ea5e0adc9ecaea1ce8abd842ec972eb8718 https://git.kernel.org/stable/c/a673cf6c4ac702cb79ac1f4d7fc4de763a6a3e40 https://git.kernel.org/stable/c/ebb39b2d81731b83ee71a1ba6dd0291a57b5ac07 https://git.kernel.org/stable/c/ed4033fb85ccaaf6c3983be3c7b037e48253d232 https://git.kernel.org/stable/c/f4b69c35813c432973d340d3600c01de106ed474

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-06-24T16:30:14.463Z

Updated: 2026-06-24T16:30:14.463Z

Reserved: 2026-06-09T07:44:35.383Z

Link: CVE-2026-53073

Vulnrichment

No data.

NVD

No data.

Redhat

Severity : Moderate

Publid Date: 2026-06-24T00:00:00Z

Links: CVE-2026-53073 - Bugzilla

OpenCVE Enrichment

Updated: 2026-06-26T02:30:17Z

Weaknesses

Tracking

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

Subscriptions

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