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Fencer Vulns
high 8.8

CVE-2023-53297 json

Bluetooth: L2CAP: fix "bad unlock balance" in l2cap_disconnect_rsp

published 2025-09-16 13 mo ago modified 2026-08-05 3 mo ago also EUVD-2023-59892

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: L2CAP: fix "bad unlock balance" in l2cap_disconnect_rsp

conn->chan_lock isn't acquired before l2cap_get_chan_by_scid, if l2cap_get_chan_by_scid returns NULL, then 'bad unlock balance' is triggered.

Patch / fix

  • Linux Linux 4.14.316, 4.19.284, 5.4.244, 5.10.181, 5.15.113, 6.1.30, 6.3, 6.3.4, 6.4
  • linux Debian 12 6.1.37-1
  • linux Debian 14, Debian 13 6.3.7-1

debian advisories DEBIAN-CVE-2023-53297

  • linux Ubuntu 20.04 LTS 5.4.0-162.179
  • linux Ubuntu 22.04 LTS 5.15.0-83.92
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1109.118
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1044.49
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1112.121
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1041.49
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1041.46
  • linux-ibm Ubuntu 20.04 LTS 5.4.0-1056.61

ubuntu advisories UBUNTU-CVE-2023-53297

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-rt RHEL 8 4.18.0-553.81.1.rt7.422.el8_10
  • kernel-rt-kvm RHEL 8 4.18.0-553.81.1.rt7.422.el8_10
  • kernel-rt-core RHEL 8 4.18.0-553.81.1.rt7.422.el8_10
  • kernel-rt-modules RHEL 8 4.18.0-553.81.1.rt7.422.el8_10
  • kernel-rt-debug-kvm RHEL 8 4.18.0-553.81.1.rt7.422.el8_10
  • kernel-rt-debug-core RHEL 8 4.18.0-553.81.1.rt7.422.el8_10
  • kernel-rt-debug-modules RHEL 8 4.18.0-553.81.1.rt7.422.el8_10
  • kernel-rt-modules-extra RHEL 8 4.18.0-553.81.1.rt7.422.el8_10

red hat advisories RHSA-2025:23960RHSA-2025:23947RHSA-2025:23463RHSA-2025:23445RHSA-2025:22124RHSA-2025:22095

  • kernel-rt SLE Micro 5.5 5.14.21-150500.13.109.1
  • kernel-source-rt SLE Micro 5.5 5.14.21-150500.13.109.1
  • kernel-rt SLE Micro 5.4, SLE Micro 5.3 5.14.21-150400.15.133.1
  • kernel-source-rt SLE Micro 5.4, SLE Micro 5.3 5.14.21-150400.15.133.1
  • kernel-64kb SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS, SLE High Performance Computing 15 SP4-ESPOS 5.14.21-150400.24.179.1
  • kernel-syms SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +3 more 5.14.21-150400.24.179.1
  • kernel-source SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +3 more 5.14.21-150400.24.179.1
  • kernel-default SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +7 more 5.14.21-150400.24.179.1

suse advisories SUSE-SU-2025:3761-1SUSE-SU-2025:3716-1SUSE-SU-2025:03628-1SUSE-SU-2025:03615-1

  • kernel AlmaLinux 8 4.18.0-553.81.1.el8_10
  • perf AlmaLinux 8 4.18.0-553.81.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.81.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.81.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.81.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.81.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.81.1.el8_10
  • kernel-zfcpdump AlmaLinux 8 4.18.0-553.81.1.el8_10

almalinux advisories ALSA-2025:19102ALSA-2025:19103

  • kernel-rt Rocky Linux 8 4.18.0-553.81.1.rt7.422.el8_10
  • kernel Rocky Linux 8 4.18.0-553.81.1.el8_10

rocky linux advisories RLSA-2025:19103RLSA-2025:19102

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-2023-53297 updated cvss 7.0

kernel: Bluetooth: L2CAP: fix "bad unlock balance" in l2cap_disconnect_rsp

  • 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: 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 AppStream E4S (v.9.0) perf 5.14.0-70.155.1.el9_0, kernel-devel-matched 5.14.0-70.155.1.el9_0, kernel-debug-devel-matched 5.14.0-70.155.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.155.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.155.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.155.1.el9_0, +2 more
    fixed: vendor fix RHSA-2025:22066
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.148.1.el9_2, rtla 5.14.0-284.148.1.el9_2, kernel-devel-matched 5.14.0-284.148.1.el9_2, kernel-64k-devel-matched 5.14.0-284.148.1.el9_2, kernel-debug-devel-matched 5.14.0-284.148.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.148.1.el9_2, +5 more
    fixed: vendor fix RHSA-2025:22095
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.81.1.el8_10, kernel 4.18.0-553.81.1.el8_10, bpftool 4.18.0-553.81.1.el8_10, kernel-core 4.18.0-553.81.1.el8_10, kernel-tools 4.18.0-553.81.1.el8_10, python3-perf 4.18.0-553.81.1.el8_10, +15 more
    fixed: vendor fix RHSA-2025:19102
  • 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 BaseOS AUS (v. 8.2) perf 4.18.0-193.178.1.el8_2, kernel 4.18.0-193.178.1.el8_2, bpftool 4.18.0-193.178.1.el8_2, kernel-core 4.18.0-193.178.1.el8_2, kernel-tools 4.18.0-193.178.1.el8_2, python3-perf 4.18.0-193.178.1.el8_2, +8 more
    fixed: vendor fix RHSA-2025:23445
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.182.1.el8_4, kernel 4.18.0-305.182.1.el8_4, bpftool 4.18.0-305.182.1.el8_4, kernel-core 4.18.0-305.182.1.el8_4, kernel-tools 4.18.0-305.182.1.el8_4, python3-perf 4.18.0-305.182.1.el8_4, +8 more
    fixed: vendor fix RHSA-2025:23463
show 18 more
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.170.1.el8_6, kernel 4.18.0-372.170.1.el8_6, bpftool 4.18.0-372.170.1.el8_6, kernel-core 4.18.0-372.170.1.el8_6, kernel-tools 4.18.0-372.170.1.el8_6, python3-perf 4.18.0-372.170.1.el8_6, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.170.1.el8_6, kernel 4.18.0-372.170.1.el8_6, bpftool 4.18.0-372.170.1.el8_6, kernel-core 4.18.0-372.170.1.el8_6, kernel-tools 4.18.0-372.170.1.el8_6, python3-perf 4.18.0-372.170.1.el8_6, +15 more
    fixed: vendor fix RHSA-2025:22006
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.120.1.el8_8, kernel 4.18.0-477.120.1.el8_8, bpftool 4.18.0-477.120.1.el8_8, kernel-core 4.18.0-477.120.1.el8_8, kernel-tools 4.18.0-477.120.1.el8_8, python3-perf 4.18.0-477.120.1.el8_8, +9 more
    fixed: vendor fix RHSA-2025:22072
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.155.1.el9_0, bpftool 5.14.0-70.155.1.el9_0, kernel-core 5.14.0-70.155.1.el9_0, kernel-tools 5.14.0-70.155.1.el9_0, python3-perf 5.14.0-70.155.1.el9_0, kernel-modules 5.14.0-70.155.1.el9_0, +14 more
    fixed: vendor fix RHSA-2025:22066
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.148.1.el9_2, kernel 5.14.0-284.148.1.el9_2, kernel-64k 5.14.0-284.148.1.el9_2, kernel-core 5.14.0-284.148.1.el9_2, kernel-tools 5.14.0-284.148.1.el9_2, python3-perf 5.14.0-284.148.1.el9_2, +28 more
    fixed: vendor fix RHSA-2025:22095
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.182.1.el8_4, kernel 4.18.0-305.182.1.el8_4, bpftool 4.18.0-305.182.1.el8_4, kernel-core 4.18.0-305.182.1.el8_4, kernel-tools 4.18.0-305.182.1.el8_4, python3-perf 4.18.0-305.182.1.el8_4, +8 more
    fixed: vendor fix RHSA-2025:23463
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.170.1.el8_6, kernel 4.18.0-372.170.1.el8_6, bpftool 4.18.0-372.170.1.el8_6, kernel-core 4.18.0-372.170.1.el8_6, kernel-tools 4.18.0-372.170.1.el8_6, python3-perf 4.18.0-372.170.1.el8_6, +8 more
    fixed: vendor fix RHSA-2025:22006
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.120.1.el8_8, kernel 4.18.0-477.120.1.el8_8, bpftool 4.18.0-477.120.1.el8_8, kernel-core 4.18.0-477.120.1.el8_8, kernel-tools 4.18.0-477.120.1.el8_8, python3-perf 4.18.0-477.120.1.el8_8, +8 more
    fixed: vendor fix RHSA-2025:22072
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.81.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.81.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.81.1.el8_10
    fixed: vendor fix RHSA-2025:19102
  • 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 for Real Time (v. 7 ELS) kernel-rt 3.10.0-1160.144.1.rt56.1296.el7, kernel-rt-trace 3.10.0-1160.144.1.rt56.1296.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.144.1.rt56.1296.el7
    fixed: vendor fix RHSA-2025:23960
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-kvm 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-core 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-modules 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-debug-kvm 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-debug-core 4.18.0-553.81.1.rt7.422.el8_10, +4 more
    fixed: vendor fix RHSA-2025:19103
  • 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 NFV E4S (v.9.0) kernel-rt 5.14.0-70.155.1.rt21.227.el9_0, kernel-rt-kvm 5.14.0-70.155.1.rt21.227.el9_0, kernel-rt-core 5.14.0-70.155.1.rt21.227.el9_0, kernel-rt-modules 5.14.0-70.155.1.rt21.227.el9_0, kernel-rt-debug-kvm 5.14.0-70.155.1.rt21.227.el9_0, kernel-rt-debug-core 5.14.0-70.155.1.rt21.227.el9_0, +4 more Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.155.1.rt21.227.el9_0, kernel-rt-core 5.14.0-70.155.1.rt21.227.el9_0, kernel-rt-modules 5.14.0-70.155.1.rt21.227.el9_0, kernel-rt-debug-core 5.14.0-70.155.1.rt21.227.el9_0, kernel-rt-debug-modules 5.14.0-70.155.1.rt21.227.el9_0, kernel-rt-modules-extra 5.14.0-70.155.1.rt21.227.el9_0, +2 more
    fixed: vendor fix RHSA-2025:22087
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-core 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-modules 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-debug-core 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-modules-core 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-debug-modules 5.14.0-284.148.1.rt14.433.el9_2, +4 more Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-kvm 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-core 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-modules 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-debug-kvm 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-debug-core 5.14.0-284.148.1.rt14.433.el9_2, +6 more
    fixed: vendor fix RHSA-2025:22124
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-core 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-modules 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-debug-core 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-debug-modules 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-modules-extra 4.18.0-553.81.1.rt7.422.el8_10, +2 more
    fixed: vendor fix RHSA-2025:19103
  • 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 Server (v. 7 ELS) perf 3.10.0-1160.144.1.el7, kernel 3.10.0-1160.144.1.el7, bpftool 3.10.0-1160.144.1.el7, python-perf 3.10.0-1160.144.1.el7, kernel-kdump 3.10.0-1160.144.1.el7, kernel-tools 3.10.0-1160.144.1.el7, +7 more Red Hat Enterprise Linux Server Optional (v. 7 ELS) kernel-debuginfo-common-ppc64 3.10.0-1160.144.1.el7, kernel-debuginfo-common-x86_64 3.10.0-1160.144.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1160.144.1.el7
    fixed: vendor fix RHSA-2025:23947
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 10 kernel
    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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
9 mo ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADP 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Technology feeds

References

Sources

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.