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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.","metrics":{"cvssV2_0":{},"cvssV3_0":{},"cvssV3_1":{"score":7.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L"},"cvssV4_0":{}},"mitre_repo_path":"cves/2026/64xxx/CVE-2026-64126.json","references":["https://git.kernel.org/stable/c/0bc1a5a69f541859293d79db72bd7854ac48df51","https://git.kernel.org/stable/c/0d5104390b445e7bd664ad583837e4c04d892c9d","https://git.kernel.org/stable/c/14b01b9cba04e6ce82825f68fc4c4322fa4ffa43","https://git.kernel.org/stable/c/a143ce77a5292f2c9285137433d879ce71d190a7","https://git.kernel.org/stable/c/a6c75a3fad226ccbd8ef9110dee87c92c299f2ab","https://git.kernel.org/stable/c/d3f7d17960ed50df3a6709c5158caff989c8c905","https://git.kernel.org/stable/c/f1febe93ef075314615f970a87681d9ab86691d1"],"title":"Bluetooth: MGMT: validate Add Extended Advertising Data length","updated":"2026-08-05T12:39:32.975000+00:00","vendors":["linux","linux$PRODUCT$linux_kernel"],"weaknesses":[]},"nvd":{"cpes":["cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","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:7.1:rc3:*:*:*:*:*:*","cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*"],"created":"2026-07-19T16:17:54.260000+00:00","description":"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 the fixed header size.  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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.","metrics":{"cvssV2_0":{},"cvssV3_0":{},"cvssV3_1":{"score":7.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L"},"cvssV4_0":{}},"nvd_repo_path":"2026/CVE-2026-64126.json","references":["https://git.kernel.org/stable/c/0bc1a5a69f541859293d79db72bd7854ac48df51","https://git.kernel.org/stable/c/0d5104390b445e7bd664ad583837e4c04d892c9d","https://git.kernel.org/stable/c/14b01b9cba04e6ce82825f68fc4c4322fa4ffa43","https://git.kernel.org/stable/c/a143ce77a5292f2c9285137433d879ce71d190a7","https://git.kernel.org/stable/c/a6c75a3fad226ccbd8ef9110dee87c92c299f2ab","https://git.kernel.org/stable/c/d3f7d17960ed50df3a6709c5158caff989c8c905","https://git.kernel.org/stable/c/f1febe93ef075314615f970a87681d9ab86691d1"],"title":null,"updated":"2026-08-13T15:11:16.750000+00:00","vendors":["linux","linux$PRODUCT$linux_kernel"],"weaknesses":["CWE-125"]},"opencve":{"changes":[{"created":"2026-07-19T16:15:00+00:00","data":[{"details":{"new":"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 the fixed header size.  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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.\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.  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