CVE-2026-64126
Bluetooth: MGMT: validate Add Extended Advertising Data length
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: validate Add Extended Advertising Data length MGMT_OP_ADD_EXT_ADV_DATA is registered as a variable-length command, with MGMT_ADD_EXT_ADV_DATA_SIZE as the fixed header size. The handler then uses cp->adv_data_len and cp->scan_rsp_len to validate and copy cp->data, but it never checks that those bytes are part of the mgmt command payload. A short command can therefore make add_ext_adv_data() pass an out-of-bounds pointer into tlv_data_is_valid(). If the bytes beyond the command buffer are addressable, they can also be copied into the advertising instance as scan response data, where the caller can read them back via MGMT_OP_GET_ADV_INSTANCE. The trigger requires CAP_NET_ADMIN in the initial user namespace; KASAN reports an 8-byte slab-out-of-bounds read. Reject commands whose length does not match the fixed header plus both advertising data lengths before parsing cp->data.
INFO
Published Date :
July 19, 2026, 4:17 p.m.
Last Modified :
July 19, 2026, 4:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-64126
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Validate command length against header and data lengths.
- Reject commands with mismatched lengths.
- Ensure advertising data lengths are within bounds.
- 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-2026-64126.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64126 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-2026-64126
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-2026-64126 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64126 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.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 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': '12410572833a283ce92fcf9679ca8a2f372097ee', 'lessThan': '0d5104390b445e7bd664ad583837e4c04d892c9d', 'versionType': 'git'}, {'status': 'affected', 'version': '12410572833a283ce92fcf9679ca8a2f372097ee', 'lessThan': '14b01b9cba04e6ce82825f68fc4c4322fa4ffa43', 'versionType': 'git'}, {'status': 'affected', 'version': '12410572833a283ce92fcf9679ca8a2f372097ee', 'lessThan': 'a143ce77a5292f2c9285137433d879ce71d190a7', 'versionType': 'git'}, {'status': 'affected', 'version': '12410572833a283ce92fcf9679ca8a2f372097ee', 'lessThan': 'a6c75a3fad226ccbd8ef9110dee87c92c299f2ab', 'versionType': 'git'}, {'status': 'affected', 'version': '12410572833a283ce92fcf9679ca8a2f372097ee', 'lessThan': 'f1febe93ef075314615f970a87681d9ab86691d1', 'versionType': 'git'}, {'status': 'affected', 'version': '12410572833a283ce92fcf9679ca8a2f372097ee', 'lessThan': '0bc1a5a69f541859293d79db72bd7854ac48df51', 'versionType': 'git'}, {'status': 'affected', 'version': '12410572833a283ce92fcf9679ca8a2f372097ee', 'lessThan': 'd3f7d17960ed50df3a6709c5158caff989c8c905', 'versionType': 'git'}], 'programFiles': ['net/bluetooth/mgmt.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.11'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.11', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.210', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.175', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.142', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.92', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.34', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.11', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/bluetooth/mgmt.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: validate Add Extended Advertising Data length MGMT_OP_ADD_EXT_ADV_DATA is registered as a variable-length command, with MGMT_ADD_EXT_ADV_DATA_SIZE as the fixed header size. The handler then uses cp->adv_data_len and cp->scan_rsp_len to validate and copy cp->data, but it never checks that those bytes are part of the mgmt command payload. A short command can therefore make add_ext_adv_data() pass an out-of-bounds pointer into tlv_data_is_valid(). If the bytes beyond the command buffer are addressable, they can also be copied into the advertising instance as scan response data, where the caller can read them back via MGMT_OP_GET_ADV_INSTANCE. The trigger requires CAP_NET_ADMIN in the initial user namespace; KASAN reports an 8-byte slab-out-of-bounds read. Reject commands whose length does not match the fixed header plus both advertising data lengths before parsing cp->data. Added Reference https://git.kernel.org/stable/c/0bc1a5a69f541859293d79db72bd7854ac48df51 Added Reference https://git.kernel.org/stable/c/0d5104390b445e7bd664ad583837e4c04d892c9d Added Reference https://git.kernel.org/stable/c/14b01b9cba04e6ce82825f68fc4c4322fa4ffa43 Added Reference https://git.kernel.org/stable/c/a143ce77a5292f2c9285137433d879ce71d190a7 Added Reference https://git.kernel.org/stable/c/a6c75a3fad226ccbd8ef9110dee87c92c299f2ab Added Reference https://git.kernel.org/stable/c/d3f7d17960ed50df3a6709c5158caff989c8c905 Added Reference https://git.kernel.org/stable/c/f1febe93ef075314615f970a87681d9ab86691d1