Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 4.14.313 – < 4.14.316, 4.19.281 – < 4.19.284, 5.4.241 – < 5.4.244, 5.10.178 – < 5.10.181, 5.15.108 – < 5.15.113, 6.1.25 – < 6.1.30, 6.2.12 – < 6.3, 6.3 | 4.14.316 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 6.3.7-1 | — |
| Debian 13 | linux | 6.3.7-1 | — |
| Debian 12 | linux | 6.1.37-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1023.25 | — |
| Ubuntu 24.04 LTS | linux-intel +9 | No fix yet | — |
| Ubuntu 22.04 LTS | linux +1 | 5.15.0-83.92 | — |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1044.49 | — |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1046.53 | — |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1046.53.1 | — |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1041.49 | — |
| Ubuntu 22.04 LTS | linux-gke +1 | 5.15.0-1041.46 | — |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1027.32 | — |
| Ubuntu 22.04 LTS | linux-ibm +1 | 5.15.0-1037.40 | — |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1039.45 | — |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1032.32 | — |
| Ubuntu 22.04 LTS | linux-nvidia-tegra | 5.15.0-1017.17 | — |
| Ubuntu 22.04 LTS | linux-nvidia-tegra-igx | 5.15.0-1004.4 | — |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1042.48 | — |
| Ubuntu 22.04 LTS | linux-riscv +32 | No fix yet | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-162.179 | — |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1109.118 | — |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1044.49~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1115.122 | — |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1046.53~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1070.76 | — |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1112.121 | — |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1041.49~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-hwe-5.15 +1 | 5.15.0-83.92~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-ibm | 5.4.0-1056.61 | — |
| Ubuntu 20.04 LTS | linux-ibm-5.15 | 5.15.0-1037.40~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1040.46~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-iot | 5.4.0-1021.22 | — |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1098.104 | — |
| Ubuntu 20.04 LTS | linux-nvidia-tegra-5.15 | 5.15.0-1017.17~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1108.117 | — |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1042.48~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1093.104 | — |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1040.44~20.04.3 | — |
| Ubuntu 20.04 LTS | linux-xilinx-zynqmp | 5.4.0-1029.33 | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-intel-iot-realtime | 5.15.0-1038.40 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1045.50 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-aws-fips | 5.4.0-1109.118+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1115.122+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1084.93 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1112.121+fips1 | — |
| Ubuntu Pro 18.04 LTS | linux-aws-5.4 | 5.4.0-1109.118~18.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux-azure-5.4 | 5.4.0-1115.122~18.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux-gcp-5.4 | 5.4.0-1112.121~18.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux-hwe-5.4 | 5.4.0-162.179~18.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux-ibm-5.4 | 5.4.0-1056.61~18.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux-oracle-5.4 | 5.4.0-1108.117~18.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux-raspi-5.4 | 5.4.0-1093.104~18.04.1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | bpftool | 7.3.0-427.13.1.el9_4 | RHSA-2024:2394 |
| RHEL 9 | rv +64 | 5.14.0-427.13.1.el9_4 | RHSA-2024:2394 |
| RHEL 8 | kernel-rt +12 | 4.18.0-553.81.1.rt7.422.el8_10 | RHSA-2025:19103 |
| RHEL 8 | perf +26 | 4.18.0-553.81.1.el8_10 | RHSA-2025:19102 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhel Extras Rt Els 7 | kernel-rt +7 | 3.10.0-1160.144.1.rt56.1296.el7 | RHSA-2025:23960 |
| RHEL 9.2 E4S | bpftool | 7.0.0-284.148.1.el9_2 | RHSA-2025:22095 |
| RHEL 9.2 E4S | kernel-rt +14 | 5.14.0-284.148.1.rt14.433.el9_2 | RHSA-2025:22124 |
| RHEL 9.2 E4S | perf +47 | 5.14.0-284.148.1.el9_2 | RHSA-2025:22095 |
| RHEL 9.0 E4S | kernel-rt +12 | 5.14.0-70.155.1.rt21.227.el9_0 | RHSA-2025:22087 |
| RHEL 9.0 E4S | perf +28 | 5.14.0-70.155.1.el9_0 | RHSA-2025:22066 |
| RHEL 8.8 TUS | perf +17 | 4.18.0-477.120.1.el8_8 | RHSA-2025:22072 |
| RHEL 8.8 E4S | perf +18 | 4.18.0-477.120.1.el8_8 | RHSA-2025:22072 |
| RHEL 8.6 TUS | perf +17 | 4.18.0-372.170.1.el8_6 | RHSA-2025:22006 |
| RHEL 8.6 E4S | perf +25 | 4.18.0-372.170.1.el8_6 | RHSA-2025:22006 |
| RHEL 8.6 AUS | perf +17 | 4.18.0-372.170.1.el8_6 | RHSA-2025:22006 |
| RHEL 8.4 EUS Long Life | perf +17 | 4.18.0-305.182.1.el8_4 | RHSA-2025:23463 |
| RHEL 8.4 AUS | perf +17 | 4.18.0-305.182.1.el8_4 | RHSA-2025:23463 |
| RHEL 8.2 AUS | perf +17 | 4.18.0-193.178.1.el8_2 | RHSA-2025:23445 |
| RHEL 7 ELS | perf +18 | 3.10.0-1160.144.1.el7 | RHSA-2025:23947 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | kernel-rt +9 | 4.18.0-553.81.1.rt7.422.el8_10 | ALSA-2025:19103 |
| AlmaLinux 8 | perf +24 | 4.18.0-553.81.1.el8_10 | ALSA-2025:19102 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | kernel | 4.18.0-553.81.1.el8_10 | RLSA-2025:19102 |
| Rocky Linux 8 | kernel-rt | 4.18.0-553.81.1.rt7.422.el8_10 | RLSA-2025:19103 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | kernel-64kb +6 | 5.14.21-150500.55.124.1 | SUSE-SU-2025:03615-1 |
| SLES 15 SP5 | kernel-default-base | 5.14.21-150500.55.124.1.150500.6.59.1 | SUSE-SU-2025:03615-1 |
| SLES 15 SP4 | kernel-64kb +6 | 5.14.21-150400.24.179.1 | SUSE-SU-2025:03628-1 |
| SLES 15 SP4 | kernel-default-base | 5.14.21-150400.24.179.1.150400.24.92.1 | SUSE-SU-2025:03628-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | kernel-default-base | 5.14.21-150500.55.124.1.150500.6.59.1 | SUSE-SU-2025:03615-1 |
| SLES for SAP 15 SP5 | kernel-docs +4 | 5.14.21-150500.55.124.1 | SUSE-SU-2025:03615-1 |
| SLES for SAP 15 SP4 | kernel-default-base | 5.14.21-150400.24.179.1.150400.24.92.1 | SUSE-SU-2025:03628-1 |
| SLES for SAP 15 SP4 | kernel-docs +4 | 5.14.21-150400.24.179.1 | SUSE-SU-2025:03628-1 |
| SLE Micro 5.5 | kernel-default-base | 5.14.21-150500.55.124.1.150500.6.59.1 | SUSE-SU-2025:03615-1 |
| SLE Micro 5.5 | kernel-rt +1 | 5.14.21-150500.13.109.1 | SUSE-SU-2025:3761-1 |
| SLE Micro 5.5 | kernel-source +1 | 5.14.21-150500.55.124.1 | SUSE-SU-2025:03615-1 |
| SLE Micro 5.4 | kernel-default | 5.14.21-150400.24.179.1 | SUSE-SU-2025:03628-1 |
| SLE Micro 5.4 | kernel-default-base | 5.14.21-150400.24.179.1.150400.24.92.1 | SUSE-SU-2025:03628-1 |
| SLE Micro 5.4 | kernel-rt +1 | 5.14.21-150400.15.133.1 | SUSE-SU-2025:3716-1 |
| SLE Micro 5.3 | kernel-default | 5.14.21-150400.24.179.1 | SUSE-SU-2025:03628-1 |
| SLE Micro 5.3 | kernel-default-base | 5.14.21-150400.24.179.1.150400.24.92.1 | SUSE-SU-2025:03628-1 |
| SLE Micro 5.3 | kernel-rt +1 | 5.14.21-150400.15.133.1 | SUSE-SU-2025:3716-1 |
| SLE Live Patching 15 SP5 | kernel-default | 5.14.21-150500.55.124.1 | SUSE-SU-2025:03615-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_31 | 1-150500.11.3.1 | SUSE-SU-2025:03615-1 |
| SLE Live Patching 15 SP4 | kernel-default | 5.14.21-150400.24.179.1 | SUSE-SU-2025:03628-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_45 | 1-150400.9.3.1 | SUSE-SU-2025:03628-1 |
| SLE HPC 15 SP5 | kernel-64kb +5 | 5.14.21-150500.55.124.1 | SUSE-SU-2025:03615-1 |
| SLE HPC 15 SP5 | kernel-default-base | 5.14.21-150500.55.124.1.150500.6.59.1 | SUSE-SU-2025:03615-1 |
| SLE HPC 15 SP4 | kernel-64kb +5 | 5.14.21-150400.24.179.1 | SUSE-SU-2025:03628-1 |
| SLE HPC 15 SP4 | kernel-default-base | 5.14.21-150400.24.179.1.150400.24.92.1 | SUSE-SU-2025:03628-1 |
| SUSE Manager Server LTS 4.3 | kernel-default-base | 5.14.21-150400.24.179.1.150400.24.92.1 | SUSE-SU-2025:03628-1 |
| SUSE Manager Server LTS 4.3 | kernel-syms +3 | 5.14.21-150400.24.179.1 | SUSE-SU-2025:03628-1 |
| SUSE Manager Proxy LTS 4.3 | kernel-default-base | 5.14.21-150400.24.179.1.150400.24.92.1 | SUSE-SU-2025:03628-1 |
| SUSE Manager Proxy LTS 4.3 | kernel-syms +2 | 5.14.21-150400.24.179.1 | SUSE-SU-2025:03628-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | perf +19 | 4.18.0-553.81.1.el8_10 | ELSA-2025-19102 |
| Oracle Linux 7 | perf +12 | 3.10.0-1160.119.1.0.16.el7 | ELSA-2025-23947 |
Advisories 24
- WID-SEC-2025-2053 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 9, 2026
- ALSA-2025:19102 Moderate: kernel security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:19103 Moderate: kernel-rt security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:2394 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:23463 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Oct 2, 2026
- RHSA-2025:23445 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Oct 2, 2026
- RHSA-2025:23960 Red Hat Security Advisory: kernel-rt security update Red Hat Security Advisories (RHSA) · Aug 20, 2026
- RHSA-2025:23947 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Aug 20, 2026
- RHSA-2025:22087 Red Hat Security Advisory: kernel-rt security update Red Hat Security Advisories (RHSA) · Aug 20, 2026
- RHSA-2025:22066 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Aug 20, 2026
- RHSA-2025:22072 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Aug 20, 2026
- RHSA-2025:22006 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Aug 20, 2026
- RHSA-2025:22095 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Aug 6, 2026
- RHSA-2025:22124 Red Hat Security Advisory: kernel-rt security update Red Hat Security Advisories (RHSA) · Aug 6, 2026
- RHSA-2025:19103 Red Hat Security Advisory: kernel-rt security update Red Hat Security Advisories (RHSA) · Aug 6, 2026
- RHSA-2025:19102 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Aug 6, 2026
- SUSE-SU-2025:03615-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:3761-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:03628-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:3716-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2025-23947 Moderate: kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 30, 2026
- RLSA-2025:19103 Moderate: kernel-rt security update Rocky Linux Security Advisories · Nov 2, 2025
- RLSA-2025:19102 Moderate: kernel security update Rocky Linux Security Advisories · Nov 2, 2025
- ELSA-2025-19102 Moderate: kernel security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 27, 2025
References
- https://git.kernel.org/stable/c/5f352a56f0e607e6ff539cbf12156bfd8af232be
- https://git.kernel.org/stable/c/6a27762340ad08643de3bc17fe1646ea489ca2e2
- https://git.kernel.org/stable/c/2112c4c47d36bc5aba3ddeb9afedce6ae6a67e7d
- https://git.kernel.org/stable/c/55410a9144c76ecda126e6cdec556dfcd8f343b2
- https://git.kernel.org/stable/c/116b9c002c894097adc2b8684db2d1da4229ed46
- https://git.kernel.org/stable/c/fd269a0435f8e9943b7a57c5a59688848d42d449
- https://git.kernel.org/stable/c/5134556c9be582793f30695c09d18a26fe1ff2d7
- https://git.kernel.org/stable/c/25e97f7b1866e6b8503be349eeea44bb52d661ce