{"id":"CVE-2026-64126","title":"Bluetooth: MGMT: validate Add Extended Advertising Data length","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: validate Add Extended Advertising Data length\n\nMGMT_OP_ADD_EXT_ADV_DATA is registered as a variable-length command,\nwith MGMT_ADD_EXT_ADV_DATA_SIZE as …","severity":"high","cvss":7.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < 0d5104390b445e7bd664ad583837e4c04d892c9d","Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < 14b01b9cba04e6ce82825f68fc4c4322fa4ffa43","Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < a143ce77a5292f2c9285137433d879ce71d190a7","Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < a6c75a3fad226ccbd8ef9110dee87c92c299f2ab","Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < f1febe93ef075314615f970a87681d9ab86691d1","Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < 0bc1a5a69f541859293d79db72bd7854ac48df51","Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < d3f7d17960ed50df3a6709c5158caff989c8c905","Linux 5.11"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:36:50.332780Z"},"published":"2026-07-19","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:42:24.427Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64126","references":[{"url":"https://git.kernel.org/stable/c/0d5104390b445e7bd664ad583837e4c04d892c9d"},{"url":"https://git.kernel.org/stable/c/14b01b9cba04e6ce82825f68fc4c4322fa4ffa43"},{"url":"https://git.kernel.org/stable/c/a143ce77a5292f2c9285137433d879ce71d190a7"},{"url":"https://git.kernel.org/stable/c/a6c75a3fad226ccbd8ef9110dee87c92c299f2ab"},{"url":"https://git.kernel.org/stable/c/f1febe93ef075314615f970a87681d9ab86691d1"},{"url":"https://git.kernel.org/stable/c/0bc1a5a69f541859293d79db72bd7854ac48df51"},{"url":"https://git.kernel.org/stable/c/d3f7d17960ed50df3a6709c5158caff989c8c905"}],"tags":["cve.org"],"epss":0.00135,"epssPercentile":0.02644,"ingestedAt":"2026-10-16T17:24:46.807Z","slug":"CVE-2026-64126","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: validate Add Extended Advertising Data length\n\nMGMT_OP_ADD_EXT_ADV_DATA is registered as a variable-length command,\nwith MGMT_ADD_EXT_ADV_DATA_SIZE as the fixed header size.  The handler\nthen uses cp->adv_data_len and cp->scan_rsp_len to validate and copy\ncp->data, but it never checks that those bytes are part of the mgmt\ncommand payload.\n\nA short command can therefore make add_ext_adv_data() pass an\nout-of-bounds pointer into tlv_data_is_valid().  If the bytes beyond\nthe command buffer are addressable, they can also be copied into the\nadvertising instance as scan response data, where the caller can read\nthem back via MGMT_OP_GET_ADV_INSTANCE.  The trigger requires\nCAP_NET_ADMIN in the initial user namespace; KASAN reports an 8-byte\nslab-out-of-bounds read.\n\nReject commands whose length does not match the fixed header plus both\nadvertising data lengths before parsing cp->data.\n\n## Affected\n\n- `Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < 0d5104390b445e7bd664ad583837e4c04d892c9d`\n- `Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < 14b01b9cba04e6ce82825f68fc4c4322fa4ffa43`\n- `Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < a143ce77a5292f2c9285137433d879ce71d190a7`\n- `Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < a6c75a3fad226ccbd8ef9110dee87c92c299f2ab`\n- `Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < f1febe93ef075314615f970a87681d9ab86691d1`\n- `Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < 0bc1a5a69f541859293d79db72bd7854ac48df51`\n- `Linux >= 12410572833a283ce92fcf9679ca8a2f372097ee < d3f7d17960ed50df3a6709c5158caff989c8c905`\n- `Linux 5.11`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":40.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}