{"id":"CVE-2026-53073","title":"Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error\n\nWhen hci_register_dev() fails in hci_uart_register_dev()\nHCI_UART_PROTO_INIT is not cleared before calling hu-…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= a40f94f7caa8d3421b64f63ac31bc0f24c890f39 < ebb39b2d81731b83ee71a1ba6dd0291a57b5ac07","Linux >= 9e5a0f5777162e503400c70c6ed25fbbe2d38799 < ed4033fb85ccaaf6c3983be3c7b037e48253d232","Linux >= 80f14e9de6a43a0bd8194cad1003a3e6dcbc3984 < 356dee1bcac4d0d9152390561fa63331ebff211b","Linux >= 02e1bcdfdf769974e7e9fa285e295cd9852e2a38 < a673cf6c4ac702cb79ac1f4d7fc4de763a6a3e40","Linux >= 281782d2c6730241e300d630bb9f200d831ede71 < f4b69c35813c432973d340d3600c01de106ed474","Linux >= 5df5dafc171b90d0b8d51547a82657cd5a1986c7 < 3daa5818e473ed60eb69d8b5c71b651909d28c5a","Linux >= 5df5dafc171b90d0b8d51547a82657cd5a1986c7 < 194f029a4d7f739e44ebc1f473120187b4de5104","Linux >= 5df5dafc171b90d0b8d51547a82657cd5a1986c7 < 68d39ea5e0adc9ecaea1ce8abd842ec972eb8718","Linux 1dcf08fcff5ca529de6dc0395091f28854f4e54a","Linux 8e5aff600539e5faea294d9612cca50220e602b8","Linux db7509fa110dd9b11134b75894677f30353b2c51","Linux >= 5.10.237 < 5.10.258","Linux >= 5.15.181 < 5.15.209","Linux >= 6.1.135 < 6.1.175","Linux >= 6.6.88 < 6.6.141","Linux >= 6.12.24 < 6.12.91","Linux >= 5.4.293 < 5.5","Linux >= 6.13.12 < 6.14","Linux >= 6.14.3 < 6.15","Linux 6.15"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:17:48.192876Z"},"published":"2026-06-24","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:23:58.102Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53073","references":[{"url":"https://git.kernel.org/stable/c/ebb39b2d81731b83ee71a1ba6dd0291a57b5ac07"},{"url":"https://git.kernel.org/stable/c/ed4033fb85ccaaf6c3983be3c7b037e48253d232"},{"url":"https://git.kernel.org/stable/c/356dee1bcac4d0d9152390561fa63331ebff211b"},{"url":"https://git.kernel.org/stable/c/a673cf6c4ac702cb79ac1f4d7fc4de763a6a3e40"},{"url":"https://git.kernel.org/stable/c/f4b69c35813c432973d340d3600c01de106ed474"},{"url":"https://git.kernel.org/stable/c/3daa5818e473ed60eb69d8b5c71b651909d28c5a"},{"url":"https://git.kernel.org/stable/c/194f029a4d7f739e44ebc1f473120187b4de5104"},{"url":"https://git.kernel.org/stable/c/68d39ea5e0adc9ecaea1ce8abd842ec972eb8718"}],"tags":["cve.org"],"epss":0.00114,"epssPercentile":0.01493,"ingestedAt":"2026-11-06T16:57:43.298Z","slug":"CVE-2026-53073","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error\n\nWhen hci_register_dev() fails in hci_uart_register_dev()\nHCI_UART_PROTO_INIT is not cleared before calling hu->proto->close(hu)\nand setting hu->hdev to NULL. This means incoming UART data will reach\nthe protocol-specific recv handler in hci_uart_tty_receive() after\nresources are freed.\n\nClear HCI_UART_PROTO_INIT with a write lock before calling\nhu->proto->close() and setting hu->hdev to NULL. The write lock ensures\nall active readers have completed and no new reader can enter the\nprotocol recv path before resources are freed.\n\nThis allows the protocol-specific recv functions to remove the\n\"HCI_UART_REGISTERED\" guard without risking a null pointer dereference\nif hci_register_dev() fails.\n\n## Affected\n\n- `Linux >= a40f94f7caa8d3421b64f63ac31bc0f24c890f39 < ebb39b2d81731b83ee71a1ba6dd0291a57b5ac07`\n- `Linux >= 9e5a0f5777162e503400c70c6ed25fbbe2d38799 < ed4033fb85ccaaf6c3983be3c7b037e48253d232`\n- `Linux >= 80f14e9de6a43a0bd8194cad1003a3e6dcbc3984 < 356dee1bcac4d0d9152390561fa63331ebff211b`\n- `Linux >= 02e1bcdfdf769974e7e9fa285e295cd9852e2a38 < a673cf6c4ac702cb79ac1f4d7fc4de763a6a3e40`\n- `Linux >= 281782d2c6730241e300d630bb9f200d831ede71 < f4b69c35813c432973d340d3600c01de106ed474`\n- `Linux >= 5df5dafc171b90d0b8d51547a82657cd5a1986c7 < 3daa5818e473ed60eb69d8b5c71b651909d28c5a`\n- `Linux >= 5df5dafc171b90d0b8d51547a82657cd5a1986c7 < 194f029a4d7f739e44ebc1f473120187b4de5104`\n- `Linux >= 5df5dafc171b90d0b8d51547a82657cd5a1986c7 < 68d39ea5e0adc9ecaea1ce8abd842ec972eb8718`\n- `Linux 1dcf08fcff5ca529de6dc0395091f28854f4e54a`\n- `Linux 8e5aff600539e5faea294d9612cca50220e602b8`\n- `Linux db7509fa110dd9b11134b75894677f30353b2c51`\n- `Linux >= 5.10.237 < 5.10.258`\n- `Linux >= 5.15.181 < 5.15.209`\n- `Linux >= 6.1.135 < 6.1.175`\n- `Linux >= 6.6.88 < 6.6.141`\n- `Linux >= 6.12.24 < 6.12.91`\n- `Linux >= 5.4.293 < 5.5`\n- `Linux >= 6.13.12 < 6.14`\n- `Linux >= 6.14.3 < 6.15`\n- `Linux 6.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}