CVE-2026-46140
Bluetooth: btmtk: validate WMT event SKB length before struct access
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.
INFO
Published Date :
May 28, 2026, 10:16 a.m.
Last Modified :
July 4, 2026, 12:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Use skb_pull_data() to validate WMT event header.
- Pull status field bytes for FUNC_CTRL.
- Apply the provided patch.
- Update the Linux kernel.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-46140.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-46140 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-46140
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-46140 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-46140 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 04, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/36c85f7029484d5ede769f8873d16e9c8e35533c Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'd019930b0049fc2648a6b279893d8ad330596e81', 'lessThan': 'c411cf1bfde951cfa821809cf4020ba177f76e0c', 'versionType': 'git'}, {'status': 'affected', 'version': 'd019930b0049fc2648a6b279893d8ad330596e81', 'lessThan': '624fb79dadc1b65757986a9d0fdde5c0cf3fe179', 'versionType': 'git'}, {'status': 'affected', 'version': 'd019930b0049fc2648a6b279893d8ad330596e81', 'lessThan': '70d37a8b9229e394cc17ddad47e90b81d80fcd09', 'versionType': 'git'}, {'status': 'affected', 'version': 'd019930b0049fc2648a6b279893d8ad330596e81', 'lessThan': '634a4408c0615c523cf7531790f4f14a422b9206', 'versionType': 'git'}, {'status': 'affected', 'version': 'f0457842215438786e2e205ad06a4fbb8ab63cd0', 'versionType': 'git'}, {'status': 'affected', 'version': '6.6.142', 'lessThan': '6.7', 'versionType': 'semver'}], 'programFiles': ['drivers/bluetooth/btmtk.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.11'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.11', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.88', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.30', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.7', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/bluetooth/btmtk.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'f0457842215438786e2e205ad06a4fbb8ab63cd0', 'lessThan': '36c85f7029484d5ede769f8873d16e9c8e35533c', 'versionType': 'git'}, {'status': 'affected', 'version': 'd019930b0049fc2648a6b279893d8ad330596e81', 'lessThan': 'c411cf1bfde951cfa821809cf4020ba177f76e0c', 'versionType': 'git'}, {'status': 'affected', 'version': 'd019930b0049fc2648a6b279893d8ad330596e81', 'lessThan': '624fb79dadc1b65757986a9d0fdde5c0cf3fe179', 'versionType': 'git'}, {'status': 'affected', 'version': 'd019930b0049fc2648a6b279893d8ad330596e81', 'lessThan': '70d37a8b9229e394cc17ddad47e90b81d80fcd09', 'versionType': 'git'}, {'status': 'affected', 'version': 'd019930b0049fc2648a6b279893d8ad330596e81', 'lessThan': '634a4408c0615c523cf7531790f4f14a422b9206', 'versionType': 'git'}, {'status': 'affected', 'version': '6.6.142', 'lessThan': '6.6.144', 'versionType': 'semver'}], 'programFiles': ['drivers/bluetooth/btmtk.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.11'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.11', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.144', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.88', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.30', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.7', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/bluetooth/btmtk.c'], 'defaultStatus': 'affected'}] -
Initial Analysis by [email protected]
Jun. 24, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H Added CWE CWE-125 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.30 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.7 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.11 up to (excluding) 6.12.88 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.6.142 up to (excluding) 6.7 Added Reference Type kernel.org: https://git.kernel.org/stable/c/624fb79dadc1b65757986a9d0fdde5c0cf3fe179 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/634a4408c0615c523cf7531790f4f14a422b9206 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/70d37a8b9229e394cc17ddad47e90b81d80fcd09 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c411cf1bfde951cfa821809cf4020ba177f76e0c Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'd019930b0049fc2648a6b279893d8ad330596e81', 'lessThan': 'c411cf1bfde951cfa821809cf4020ba177f76e0c', 'versionType': 'git'}, {'status': 'affected', 'version': 'd019930b0049fc2648a6b279893d8ad330596e81', 'lessThan': '624fb79dadc1b65757986a9d0fdde5c0cf3fe179', 'versionType': 'git'}, {'status': 'affected', 'version': 'd019930b0049fc2648a6b279893d8ad330596e81', 'lessThan': '70d37a8b9229e394cc17ddad47e90b81d80fcd09', 'versionType': 'git'}, {'status': 'affected', 'version': 'd019930b0049fc2648a6b279893d8ad330596e81', 'lessThan': '634a4408c0615c523cf7531790f4f14a422b9206', 'versionType': 'git'}, {'status': 'affected', 'version': 'f0457842215438786e2e205ad06a4fbb8ab63cd0', 'versionType': 'git'}, {'status': 'affected', 'version': '6.6.142', 'lessThan': '6.7', 'versionType': 'semver'}], 'programFiles': ['drivers/bluetooth/btmtk.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.11'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.11', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.88', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.30', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.7', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/bluetooth/btmtk.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2026
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/624fb79dadc1b65757986a9d0fdde5c0cf3fe179 Added Reference https://git.kernel.org/stable/c/634a4408c0615c523cf7531790f4f14a422b9206 Added Reference https://git.kernel.org/stable/c/70d37a8b9229e394cc17ddad47e90b81d80fcd09 Added Reference https://git.kernel.org/stable/c/c411cf1bfde951cfa821809cf4020ba177f76e0c