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Vulnerability record · CVE-2026-46140 · published 28 May 2026

CVE-2026-46140: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

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.

7.1 CVSS 3.1 High EPSS 0.17% · top 94.8% CWE-125 · Out-of-bounds read Undergoing Analysis
7.1CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
4 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-46140), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.