CVE-2026-53073

Local system crash via stale HCI UART state

Published Jun 24, 2026 · Updated Jun 24, 2026

Use-after-free in Linux Kernel Bluetooth HCI UART affected releases allows local users to crash the system via incoming UART data. If hci_register_dev() fails, hci_uart_register_dev() closes the protocol and nulls hu->hdev without clearing HCI_UART_PROTO_INIT, so hci_uart_tty_receive() can dispatch UART input into a protocol receive handler after its resources are freed. Reachability requires a local user to drive the HCI UART receive path after device registration fails; the documented consequence is a null-pointer dereference and system crash.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Use-after-free in Linux Kernel Bluetooth HCI UART affected releases allows local users to crash the system via incoming UART data. If hci_register_dev() fails, hci_uart_register_dev() closes the protocol and nulls hu->hdev without clearing HCI_UART_PROTO_INIT, so hci_uart_tty_receive() can dispatch UART input into a protocol receive handler after its resources are freed. Reachability requires a local user to drive the HCI UART receive path after device registration fails; the documented consequence is a null-pointer dereference and system crash.

The record

CVE
CVE-2026-53073
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=02e1bcdfdf769974e7e9fa285e295cd9852e2a38 <a673cf6c4ac702cb79ac1f4d7fc4de763a6a3e40
  2. Affected versionversion=1dcf08fcff5ca529de6dc0395091f28854f4e54a
  3. Affected versionversion=281782d2c6730241e300d630bb9f200d831ede71 <f4b69c35813c432973d340d3600c01de106ed474
  4. Affected versionversion=5.10.237 <5.10.258
  5. Affected versionversion=5.15.181 <5.15.209
  6. Affected versionversion=5.4.293 <5.5
  7. Affected versionversion=5df5dafc171b90d0b8d51547a82657cd5a1986c7 <194f029a4d7f739e44ebc1f473120187b4de5104
  8. Affected versionversion=5df5dafc171b90d0b8d51547a82657cd5a1986c7 <3daa5818e473ed60eb69d8b5c71b651909d28c5a
  9. Affected versionversion=5df5dafc171b90d0b8d51547a82657cd5a1986c7 <68d39ea5e0adc9ecaea1ce8abd842ec972eb8718
  10. Affected versionversion=6.1.135 <6.1.175
  11. Affected versionversion=6.12.24 <6.12.91
  12. Affected versionversion=6.13.12 <6.14
  13. Affected versionversion=6.14.3 <6.15
  14. Affected versionversion=6.15
  15. Affected versionversion=6.6.88 <6.6.141
  16. Affected versionversion=80f14e9de6a43a0bd8194cad1003a3e6dcbc3984 <356dee1bcac4d0d9152390561fa63331ebff211b
  17. Affected versionversion=8e5aff600539e5faea294d9612cca50220e602b8
  18. Affected versionversion=9e5a0f5777162e503400c70c6ed25fbbe2d38799 <ed4033fb85ccaaf6c3983be3c7b037e48253d232
  19. Affected versionversion=a40f94f7caa8d3421b64f63ac31bc0f24c890f39 <ebb39b2d81731b83ee71a1ba6dd0291a57b5ac07
  20. Affected versionversion=db7509fa110dd9b11134b75894677f30353b2c51

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=02e1bcdfdf769974e7e9fa285e295cd9852e2a38 <a673cf6c4ac702cb79ac1f4d7fc4de763a6a3e40; version=1dcf08fcff5ca529de6dc0395091f28854f4e54a; version=281782d2c6730241e300d630bb9f200d831ede71 <f4b69c35813c432973d340d3600c01de106ed474; version=5.10.237 <5.10.258; version=5.15.181 <5.15.209; version=5.4.293 <5.5; version=5df5dafc171b90d0b8d51547a82657cd5a1986c7 <194f029a4d7f739e44ebc1f473120187b4de5104; version=5df5dafc171b90d0b8d51547a82657cd5a1986c7 <3daa5818e473ed60eb69d8b5c71b651909d28c5a; version=5df5dafc171b90d0b8d51547a82657cd5a1986c7 <68d39ea5e0adc9ecaea1ce8abd842ec972eb8718; version=6.1.135 <6.1.175; version=6.12.24 <6.12.91; version=6.13.12 <6.14; version=6.14.3 <6.15; version=6.15; version=6.6.88 <6.6.141; version=80f14e9de6a43a0bd8194cad1003a3e6dcbc3984 <356dee1bcac4d0d9152390561fa63331ebff211b; version=8e5aff600539e5faea294d9612cca50220e602b8; version=9e5a0f5777162e503400c70c6ed25fbbe2d38799 <ed4033fb85ccaaf6c3983be3c7b037e48253d232; version=a40f94f7caa8d3421b64f63ac31bc0f24c890f39 <ebb39b2d81731b83ee71a1ba6dd0291a57b5ac07; version=db7509fa110dd9b11134b75894677f30353b2c51

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo