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CVE-2023-53374

23
FAUCET Score

CVE-2023-53374 is a use-after-free vulnerability in the Linux kernel's Bluetooth stack, specifically affecting the hci_conn component. This flaw occurs when SCO/ISO connections are not properly cleaned up after an associated ACL connection is prematurely deleted, leading to potential system instability. With a CVSS score of 7.8 (High), successful exploitation could result in high confidentiality, integrity, and availability impacts, requiring local privileges and low attack complexity. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 6.3.8, < 6.4CPE match
cpe:2.3:a:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.3.8, < 6.4CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.4.1, < 6.4.16CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.5, < 6.5.3CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
6.4CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:6.4:-:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.8HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.15%
Probability of exploitation in next 30 days
EPSS Percentile
4.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0015 is in the 19th percentile among its peer group of 17,070 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2023-53374Moderate

kernel: Bluetooth: hci_conn: fail SCO/ISO via hci_conn_failed if ACL gone early

Sep 18, 2025

References

git.kernel.org / stable/c/3344d318337d9dca928fd448e966557ec5063f85
Patch
git.kernel.org / stable/c/397d58007532644b35fad746da48c41161f32a57
Patch
git.kernel.org / stable/c/e94b898463a62b72a2a8b75dea8936bf4db78e00
Patch