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Review reviewHigh

CVE-2023-53673

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: call disconnect callback before deleting conn In hci_cs_disconnect, we do hci_conn_del even if disconnection failed. ISO, L2CAP and SCO connections refer to the hci_conn without hci_conn_get, so disconn_cfm must be called so they can clean up their conn, otherwise use-after-free occurs. ISO: ========================================================== iso_sock_connect:880: sk 00000000eabd6557 iso_connect_cis:356: 70:1a:b8:98:ff:a2 -> 28:3d:c2:4a:7e:da ... iso_conn_add:140: hcon 000000001696f1fd conn 0000...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2025.10.08
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: call disconnect callback before deleting conn In hci_cs_disconnect, we do hci_conn_del even if disconnection failed. ISO, L2CAP and SCO connections refer to the hci_conn without hci_conn_get, so disconn_cfm must be called so they can clean up their conn, otherwise use-after-free occurs. ISO: ========================================================== iso_sock_connect:880: sk 00000000eabd6557 iso_connect_cis:356: 70:1a:b8:98:ff:a2 -> 28:3d:c2:4a:7e:da ... iso_conn_add:140: hcon 000000001696f1fd conn 0000...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= b8d290525e3972b5e876b2649a42bf4081d753fe < 1ecf6dc2676ead4b927c50b1be0851fa4d756574, >= b8d290525e3972b5e876b2649a42bf4081d753fe < 59bd1e476bbc7bc6dff3c61bba787095a4839796, >= b8d290525e3972b5e876b2649a42bf4081d753fe < 093a07052406b363b1b2ab489e17dbadaf3e509b, >= b8d290525e3972b5e876b2649a42bf4081d753fe < 7f7cfcb6f0825652973b780f248603e23f16ee90, >= 5.7, >= 5.7 < 5.15.200, >= 5.16 < 6.1.42, >= 6.2 < 6.4.7, 6.5
Fixed versions
5.15.200, 6.1.42, 6.4.7

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416