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Vulnerability · Published May 28, 2026 · Assigned by Linux

CVE-2026-46140Bluetooth: btmtk: validate WMT event SKB length before struct access

High 7.1

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 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.1High
Exploit odds (30 days)0.1%top 97.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btmtk: validate WMT event SKB length before struct access btmtk_usb_hci_wmt_sync() casts the WMT event response SKB data to struct btmtk_hci_wmt_evt (7 bytes) and struct btmtk_hci_wmt_evt_funcc (9 bytes) without first checking that the SKB contains enough data. A short firmware response causes out-of-bounds reads from SKB tailroom. Use skb_pull_data() to validate and advance past the base WMT event header. For the FUNC_CTRL case, pull the additional status field bytes before accessing them.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13linux6.12.88-1DEBIAN-CVE-2026-46140
Debian:14linux7.0.7-1DEBIAN-CVE-2026-46140
Ubuntu:24.04:LTSlinux6.8.0-147.147USN-8917-1
Ubuntu:24.04:LTSlinux6.8.0-147.147UBUNTU-CVE-2026-46140
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2026-46140
Ubuntu:26.04:LTSlinux7.0.0-28.28UBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-aws6.8.0-1067.70USN-8917-1
Ubuntu:24.04:LTSlinux-aws6.8.0-1067.70UBUNTU-CVE-2026-46140
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2026-46140
Ubuntu:26.04:LTSlinux-aws7.0.0-1009.9UBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-azure6.8.0-1071.79UBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-azure6.8.0-1071.79USN-8918-1
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-46140
Ubuntu:26.04:LTSlinux-azure7.0.0-1010.10UBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-azure-7.07.0.0-1014.14~24.04.1UBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1069.76UBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1069.76USN-8918-1
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-46140
Ubuntu:26.04:LTSlinux-azure-fde7.0.0-1009.9UBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-azure-fde-7.07.0.0-1013.13~24.04.1UBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-gcp6.8.0-1071.79UBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-gcp6.8.0-1071.79USN-8917-1
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2026-46140
Ubuntu:26.04:LTSlinux-gcp7.0.0-1008.8UBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-gcp-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-gke6.8.0-1066.74USN-8917-1
Ubuntu:24.04:LTSlinux-gke6.8.0-1066.74UBUNTU-CVE-2026-46140
Ubuntu:26.04:LTSlinux-gke7.0.0-1003.4UBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1052.56UBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1052.56USN-8917-1
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-28.28~24.04.1UBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-ibm6.8.0-1067.68UBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-ibm6.8.0-1067.68USN-8917-1
Ubuntu:26.04:LTSlinux-ibm7.0.0-1010.10UBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-147.147.1UBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-147.147.1USN-8917-1
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-46140
Ubuntu:26.04:LTSlinux-nvidia7.0.0-1016.16UBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-nvidia-7.07.0.0-1016.16~24.04.1UBUNTU-CVE-2026-46140
Ubuntu:26.04:LTSlinux-nvidia-bos7.0.0-2016.16UBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-46140
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1009.9UBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-oracle6.8.0-1064.67UBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-oracle6.8.0-1064.67USN-8917-1
Ubuntu:25.10linux-oracleno fix listedUBUNTU-CVE-2026-46140
Ubuntu:26.04:LTSlinux-oracle7.0.0-1008.8UBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-oracle-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-46140
Ubuntu:25.10linux-raspino fix listedUBUNTU-CVE-2026-46140
Ubuntu:26.04:LTSlinux-raspi7.0.0-1015.15UBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-46140
Ubuntu:25.10linux-realtimeno fix listedUBUNTU-CVE-2026-46140
Ubuntu:26.04:LTSlinux-realtime7.0.0-28.28.1UBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-46140
Ubuntu:25.10linux-riscvno fix listedUBUNTU-CVE-2026-46140
Ubuntu:26.04:LTSlinux-riscv7.0.0-28.28.1UBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-28.28.1~24.04.3UBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-46140
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-46140
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-46140

Affected products (as reported)

VendorProductVersions
Linux Linux f0457842215438786e2e205ad06a4fbb8ab63cd0 – before 36c85f7029484d5ede769f8873d16e9c8e35533cd019930b0049fc2648a6b279893d8ad330596e81 – before c411cf1bfde951cfa821809cf4020ba177f76e0cd019930b0049fc2648a6b279893d8ad330596e81 – before 624fb79dadc1b65757986a9d0fdde5c0cf3fe179d019930b0049fc2648a6b279893d8ad330596e81 – before 70d37a8b9229e394cc17ddad47e90b81d80fcd09d019930b0049fc2648a6b279893d8ad330596e81 – before 634a4408c0615c523cf7531790f4f14a422b92066.6.142 – before 6.6.144
Linux Linux 6.11

References