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Vulnerability · Published Dec 30, 2025 · Assigned by Linux

CVE-2023-54214Bluetooth: L2CAP: Fix potential user-after-free

High 8.8

In plain English

A high-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.3%top 77.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix potential user-after-free This fixes all instances of which requires to allocate a buffer calling alloc_skb which may release the chan lock and reacquire later which makes it possible that the chan is disconnected in the meantime.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8bpftool4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-abi-stablelists4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-core4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-cross-headers4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-debug4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-debug-core4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-debug-devel4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-debug-modules4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-debug-modules-extra4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-devel4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-doc4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-headers4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-modules4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-modules-extra4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-rt4.18.0-553.166.1.rt7.507.el8_10ALSA-2026:70403
AlmaLinux:8kernel-rt-core4.18.0-553.166.1.rt7.507.el8_10ALSA-2026:70403
AlmaLinux:8kernel-rt-debug4.18.0-553.166.1.rt7.507.el8_10ALSA-2026:70403
AlmaLinux:8kernel-rt-debug-core4.18.0-553.166.1.rt7.507.el8_10ALSA-2026:70403
AlmaLinux:8kernel-rt-debug-devel4.18.0-553.166.1.rt7.507.el8_10ALSA-2026:70403
AlmaLinux:8kernel-rt-debug-modules4.18.0-553.166.1.rt7.507.el8_10ALSA-2026:70403
AlmaLinux:8kernel-rt-debug-modules-extra4.18.0-553.166.1.rt7.507.el8_10ALSA-2026:70403
AlmaLinux:8kernel-rt-devel4.18.0-553.166.1.rt7.507.el8_10ALSA-2026:70403
AlmaLinux:8kernel-rt-modules4.18.0-553.166.1.rt7.507.el8_10ALSA-2026:70403
AlmaLinux:8kernel-rt-modules-extra4.18.0-553.166.1.rt7.507.el8_10ALSA-2026:70403
AlmaLinux:8kernel-tools4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-tools-libs4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-tools-libs-devel4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-zfcpdump4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-zfcpdump-core4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-zfcpdump-devel4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-zfcpdump-modules4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8kernel-zfcpdump-modules-extra4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8perf4.18.0-553.166.1.el8_10ALSA-2026:70402
AlmaLinux:8python3-perf4.18.0-553.166.1.el8_10ALSA-2026:70402
Debian:12linux6.1.20-1DEBIAN-CVE-2023-54214
Debian:13linux6.1.20-1DEBIAN-CVE-2023-54214
Debian:14linux6.1.20-1DEBIAN-CVE-2023-54214
Rocky Linux:8kernel0:4.18.0-553.166.1.el8_10RLSA-2026:70402
Rocky Linux:8kernel-rt0:4.18.0-553.166.1.rt7.507.el8_10RLSA-2026:70403
Ubuntu:22.04:LTSlinux5.15.0-75.82UBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-aws5.15.0-1038.43UBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-azure5.15.0-1040.47UBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2023-54214
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1041.48.1UBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-gcp5.15.0-1036.44UBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2023-54214
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-gke5.15.0-1036.41UBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1022.27UBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2023-54214
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-ibm5.15.0-1032.35UBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1033.38UBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-kvm5.15.0-1035.40UBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-75.82UBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2023-54214
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1027.27UBUNTU-CVE-2023-54214
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1015.15UBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2023-54214
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2023-54214
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-oracle5.15.0-1037.43UBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-raspi5.15.0-1032.35UBUNTU-CVE-2023-54214
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-54214
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-54214
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2023-54214
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2023-54214
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2023-54214

Affected products (as reported)

VendorProductVersions
Linux Linux a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 – before b2fde8cb2a25125111f2144604e0e7c0ebcc4bbaa6a5568c03c4805d4d250f6bd9d468eeeb4ea059 – before a6a7d1541fefddf7ca0cfb34c1bff63ff809cc49a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 – before 60aaccf16d1e099c16bebfb96428ae762cb528f7a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 – before b8ed41cc04fb74005aa51d17865ca3d022760335a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 – before 31a288a4df7f6a28e65da22a4ab2add4a963738ea6a5568c03c4805d4d250f6bd9d468eeeb4ea059 – before 64e28ecf44e46de9f01915a4146706a21c3469d2a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 – before 994e3e18908f5c4a12d07b44018e6aa85f071048a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 – before df5703348813235874d851934e957c3723d71644
Linux Linux 3.5

References