CVE-2023-53374

Kernel memory corruption via Bluetooth connection teardown

Published Sep 18, 2025 · Updated Sep 18, 2025

Use-after-free in Linux kernel Bluetooth handling allows adjacent attackers to corrupt memory during SCO or ISO connection teardown. The hci_conn cleanup path deletes a socket-referenced SCO or ISO connection without calling hci_(dis)connect_cfm when its parent ACL disappears early. Reachability requires Bluetooth proximity and an affected connection-cleanup sequence; the dangling reference permits kernel-memory misuse.

CVSS severity8.8
High
EPSS probability0.21%
Next 30 days · Sep 16, 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 handling allows adjacent attackers to corrupt memory during SCO or ISO connection teardown. The hci_conn cleanup path deletes a socket-referenced SCO or ISO connection without calling hci_(dis)connect_cfm when its parent ACL disappears early. Reachability requires Bluetooth proximity and an affected connection-cleanup sequence; the dangling reference permits kernel-memory misuse.

The record

CVE
CVE-2023-53374
Published
Sep 18, 2025
Updated
Sep 18, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2025Record 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=6.4
  2. Affected versionversion=75e35bd4b7935ceed2aacd82f55940e73bf0b63b
  3. Affected versionversion=ca1fd42e7dbfcb34890ffbf1f2f4b356776dab6f <3344d318337d9dca928fd448e966557ec5063f85
  4. Affected versionversion=ca1fd42e7dbfcb34890ffbf1f2f4b356776dab6f <397d58007532644b35fad746da48c41161f32a57
  5. Affected versionversion=ca1fd42e7dbfcb34890ffbf1f2f4b356776dab6f <e94b898463a62b72a2a8b75dea8936bf4db78e00

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=75e35bd4b7935ceed2aacd82f55940e73bf0b63b; version=ca1fd42e7dbfcb34890ffbf1f2f4b356776dab6f <3344d318337d9dca928fd448e966557ec5063f85; version=ca1fd42e7dbfcb34890ffbf1f2f4b356776dab6f <397d58007532644b35fad746da48c41161f32a57; version=ca1fd42e7dbfcb34890ffbf1f2f4b356776dab6f <e94b898463a62b72a2a8b75dea8936bf4db78e00

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8kernel.orgCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

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