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

What is CVE-2026-46140?

CVE-2026-46140 is a high-severity vulnerability in Linux kernel, published on 28 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

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.

Weakness: CWE-125

Which versions are affected by CVE-2026-46140?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-46140?

Apply the vendor's patch.

Is CVE-2026-46140 being exploited?

There is no known exploitation of CVE-2026-46140 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-90192, BELL-CVE-2026-46140, DEBIAN-CVE-2026-46140, GHSA-vpw8-mw7p-fcg5, UBUNTU-CVE-2026-46140.