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Review reviewHigh

CVE-2023-53374

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: fail SCO/ISO via hci_conn_failed if ACL gone early Not calling hci_(dis)connect_cfm before deleting conn referred to by a socket generally results to use-after-free. When cleaning up SCO connections when the parent ACL is deleted too early, use hci_conn_failed to do the connection cleanup properly. We also need to clean up ISO connections in a similar situation when connecting has started but LE Create CIS is not yet sent, so do it too here.

CVSS
7.8
EPSS
0.20%
9.68% percentile
CISA KEV
Not listed
Published
2025.09.18
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.20%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: fail SCO/ISO via hci_conn_failed if ACL gone early Not calling hci_(dis)connect_cfm before deleting conn referred to by a socket generally results to use-after-free. When cleaning up SCO connections when the parent ACL is deleted too early, use hci_conn_failed to do the connection cleanup properly. We also need to clean up ISO connections in a similar situation when connecting has started but LE Create CIS is not yet sent, so do it too here.

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= ca1fd42e7dbfcb34890ffbf1f2f4b356776dab6f < 397d58007532644b35fad746da48c41161f32a57, >= ca1fd42e7dbfcb34890ffbf1f2f4b356776dab6f < e94b898463a62b72a2a8b75dea8936bf4db78e00, >= ca1fd42e7dbfcb34890ffbf1f2f4b356776dab6f < 3344d318337d9dca928fd448e966557ec5063f85, >= 75e35bd4b7935ceed2aacd82f55940e73bf0b63b, >= 6.3.8 < 6.4, >= 6.4, >= 6.4.1 < 6.4.16, >= 6.5 < 6.5.3, 6.4
Fixed versions
6.4, 6.4.16, 6.5.3

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
CVE-2023-53374 — Linux Linux, linux kernel | SECUFOCUS NOW