hci_conn_cleanup in net/bluetooth/hci_conn.c in the Linux kernel through 6.2.9 has a use-after-free (observed in hci_conn_hash_flush) becau…

published 2023-03-31 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-32142

cvss: 7.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 19%
public exploits: 0; none known

hci_conn_cleanup in net/bluetooth/hci_conn.c in the Linux kernel through 6.2.9 has a use-after-free (observed in hci_conn_hash_flush) because of calls to hci_dev_put and hci_conn_put. There is a double free that may lead to privilege escalation.

Patch / fix

distros 5 links 2

red hat suse almalinux rocky linux azure linux

kernel RHEL 9 5.14.0-427.13.1.el9_4
rv RHEL 9 5.14.0-427.13.1.el9_4
perf RHEL 9 5.14.0-427.13.1.el9_4
rtla RHEL 9 5.14.0-427.13.1.el9_4
bpftool RHEL 9 7.3.0-427.13.1.el9_4
libperf RHEL 9 5.14.0-427.13.1.el9_4
kernel-rt RHEL 9 5.14.0-427.13.1.el9_4
kernel-64k RHEL 9 5.14.0-427.13.1.el9_4

red hat advisories RHSA-2024:2394 RHSA-2024:2950 RHSA-2024:3138

dtb-aarch64 openSUSE Leap 15.5 5.14.21-150500.55.7.1
kernel-64kb SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.7.1
kernel-syms SLE Module for Development Tools 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.7.1
kernel-obs-qa openSUSE Leap 15.5 5.14.21-150500.55.7.1
kernel-source SLE Module for Development Tools 15 SP5, SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.7.1
kernel-default SLE Workstation Extension 15 SP5, SLE Module for Legacy 15 SP5, SLE Module for Basesystem 15 SP5 +3 more 5.14.21-150500.55.7.1
kernel-kvmsmall openSUSE Leap 15.5 5.14.21-150500.55.7.1
kernel-zfcpdump SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.7.1

suse advisories SUSE-SU-2023:2871-1 SUSE-SU-2023:2809-1 SUSE-SU-2023:2805-1 SUSE-SU-2023:1800-1 SUSE-SU-2023:1811-1 SUSE-SU-2023:1892-1

kernel-rt AlmaLinux 8 4.18.0-553.rt7.342.el8_10
kernel-rt-kvm AlmaLinux 8 4.18.0-553.rt7.342.el8_10
kernel-rt-core AlmaLinux 8 4.18.0-553.rt7.342.el8_10
kernel-rt-modules AlmaLinux 8 4.18.0-553.rt7.342.el8_10
kernel-rt-debug-kvm AlmaLinux 8 4.18.0-553.rt7.342.el8_10
kernel-rt-debug-core AlmaLinux 8 4.18.0-553.rt7.342.el8_10
kernel-rt-debug-modules AlmaLinux 8 4.18.0-553.rt7.342.el8_10
kernel-rt-modules-extra AlmaLinux 8 4.18.0-553.rt7.342.el8_10

almalinux advisories ALSA-2024:2950 ALSA-2024:3138 ALSA-2024:2394

kernel Rocky Linux 8 4.18.0-553.123.1.el8_10.cloud.0.1
kernel-rt Rocky Linux 8 4.18.0-553.rt7.342.el8_10
kernel Rocky Linux 8 4.18.0-553.el8_10

rocky linux advisories RXSA-2024:3138 RLSA-2024:2950 RLSA-2024:3138

kernel CBL-Mariner 2.0 5.15.122.1-2

azure linux advisories AZL-25956

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-28464 updated 2026-11-09 cvss 7.8

Kernel: double free in hci_conn_cleanup of the bluetooth subsystem

Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
affected: workaround, no fix planned “Out of support scope”
Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
affected: workaround, no fix available
Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-427.13.1.el9_4, perf 5.14.0-427.13.1.el9_4, rtla 5.14.0-427.13.1.el9_4, kernel-devel-matched 5.14.0-427.13.1.el9_4, kernel-64k-devel-matched 5.14.0-427.13.1.el9_4, kernel-debug-devel-matched 5.14.0-427.13.1.el9_4, +6 more
fixed: vendor fix RHSA-2024:2394
Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.el8_10, kernel 4.18.0-553.el8_10, bpftool 4.18.0-553.el8_10, kernel-core 4.18.0-553.el8_10, kernel-tools 4.18.0-553.el8_10, python3-perf 4.18.0-553.el8_10, +15 more
fixed: vendor fix RHSA-2024:3138
Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.3.0-427.13.1.el9_4, kernel 5.14.0-427.13.1.el9_4, kernel-64k 5.14.0-427.13.1.el9_4, kernel-core 5.14.0-427.13.1.el9_4, kernel-tools 5.14.0-427.13.1.el9_4, python3-perf 5.14.0-427.13.1.el9_4, +28 more
fixed: vendor fix RHSA-2024:2394
Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.el8_10
fixed: vendor fix RHSA-2024:3138
Red Hat Enterprise Linux CRB (v. 9) libperf 5.14.0-427.13.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.13.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.13.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.13.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.13.1.el9_4
fixed: vendor fix RHSA-2024:2394
Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.rt7.342.el8_10, kernel-rt-kvm 4.18.0-553.rt7.342.el8_10, kernel-rt-core 4.18.0-553.rt7.342.el8_10, kernel-rt-modules 4.18.0-553.rt7.342.el8_10, kernel-rt-debug-kvm 4.18.0-553.rt7.342.el8_10, kernel-rt-debug-core 4.18.0-553.rt7.342.el8_10, +4 more
fixed: vendor fix RHSA-2024:2950

show 4 more

Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-427.13.1.el9_4, kernel-rt-kvm 5.14.0-427.13.1.el9_4, kernel-rt-core 5.14.0-427.13.1.el9_4, kernel-rt-modules 5.14.0-427.13.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.13.1.el9_4, kernel-rt-debug-core 5.14.0-427.13.1.el9_4, +6 more
fixed: vendor fix RHSA-2024:2394
Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.rt7.342.el8_10, kernel-rt-core 4.18.0-553.rt7.342.el8_10, kernel-rt-modules 4.18.0-553.rt7.342.el8_10, kernel-rt-debug-core 4.18.0-553.rt7.342.el8_10, kernel-rt-debug-modules 4.18.0-553.rt7.342.el8_10, kernel-rt-modules-extra 4.18.0-553.rt7.342.el8_10, +2 more
fixed: vendor fix RHSA-2024:2950
Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-427.13.1.el9_4, kernel-rt-core 5.14.0-427.13.1.el9_4, kernel-rt-modules 5.14.0-427.13.1.el9_4, kernel-rt-debug-core 5.14.0-427.13.1.el9_4, kernel-rt-modules-core 5.14.0-427.13.1.el9_4, kernel-rt-debug-modules 5.14.0-427.13.1.el9_4, +4 more
fixed: vendor fix RHSA-2024:2394
Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Classification

Weakness

CWE-415 Double Free

Technology feeds

Linux kernel rss critical rss

References

lore.kernel.org /lkml/20230309074645.74309-1-wzhmmmmm%40gmail.com/
mailing-list, patch
openwall.com /lists/oss-security/2023/03/28/2
mailing-list, patch
openwall.com /lists/oss-security/2023/03/28/3
mailing-list
security.netapp.com /advisory/ntap-20230517-0004/
third-party-advisory

Sources

CVE List CVE-2023-28464
NVD CVE-2023-28464

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary