CVE-2026-64126High· 7.3▾ TwilightIn 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 …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 40.2 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.1%
Last analysed / modified upstream
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.
Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < 0d5104390b445e7bd664ad583837e4c04d892c9dLinux >= 12410572833a283ce92fcf9679ca8a2f372097ee < 14b01b9cba04e6ce82825f68fc4c4322fa4ffa43Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < a143ce77a5292f2c9285137433d879ce71d190a7Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < a6c75a3fad226ccbd8ef9110dee87c92c299f2abLinux >= 12410572833a283ce92fcf9679ca8a2f372097ee < f1febe93ef075314615f970a87681d9ab86691d1Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < 0bc1a5a69f541859293d79db72bd7854ac48df51Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < d3f7d17960ed50df3a6709c5158caff989c8c905Linux 5.11Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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