What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-28 · updated 2026-07-04
• Weakness: CWE-125

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 products

• Linux kernel: from 6.6.142 before 6.7; from 6.11 before 6.12.88; from 6.13 before 6.18.30; from 6.19 before 7.0.7; 7.1-rc1, 7.1-rc2 — fixed in 6.12.88, 6.18.30, 6.7, 7.0.7

How to fix

Upgrade to a fixed version: Linux kernel 6.12.88, 6.18.30, 6.7, 7.0.7. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/36c85f7029484d5ede769f8873d16e9c8e35533c
• https://git.kernel.org/stable/c/624fb79dadc1b65757986a9d0fdde5c0cf3fe179
• https://git.kernel.org/stable/c/634a4408c0615c523cf7531790f4f14a422b9206
• https://git.kernel.org/stable/c/70d37a8b9229e394cc17ddad47e90b81d80fcd09
• https://git.kernel.org/stable/c/c411cf1bfde951cfa821809cf4020ba177f76e0c

Get alerted when CVE-2026-46140 or the next vulnerability affects your stack