cve-2026-64126
HIGH CVSS 7.3 opencve
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.
Timeline
- Published
- 2026-07-19 16:17 UTC
- Last Modified
- 2026-08-13
CVSS Details
CVSS details not available.
Affected Products
No product information available.
CVSS metrics
| Version | Base | Severity | Vector | Exploitability | Impact | Source |
|---|---|---|---|---|---|---|
| 3.1 | 7.3 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L |
mitre | ||
| 3.1 | 7.3 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L |
nvd | ||
| 3.1 | 7.3 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L |
opencve | ||
| 3.1 | 5.5 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
redhat |
References
No references available.
Linked Vulnerabilities
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},
"updated": {
"data": "2026-08-13T15:11:16.750000+00:00",
"provider": "nvd"
},
"vendors": {
"data": [
"linux",
"linux$PRODUCT$linux_kernel"
],
"providers": [
"mitre",
"nvd",
"enrichment"
]
},
"weaknesses": {
"data": [
"CWE-125",
"CWE-805"
],
"providers": [
"nvd",
"redhat"
]
}
},
"redhat": {
"cpes": [],
"created": "2026-07-19T00:00:00+00:00",
"description": "In the Linux kernel, the following vulnerability has been resolved:\nBluetooth: MGMT: validate Add Extended Advertising Data length\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.\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.\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": 5.5,
"vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
},
"threat_severity": "Moderate"
},
"redhat_repo_path": "2026/CVE-2026-64126.json",
"references": [
"https://lore.kernel.org/linux-cve-announce/2026071925-CVE-2026-64126-a17e@gregkh/T",
"https://nvd.nist.gov/vuln/detail/CVE-2026-64126",
"https://www.cve.org/CVERecord?id=CVE-2026-64126"
],
"title": "kernel: Bluetooth: MGMT: validate Add Extended Advertising Data length",
"updated": "2026-07-19T00:00:00+00:00",
"vendors": [],
"weaknesses": [
"CWE-805"
]
}
}
Enrichment data
Aggregated bundle (all enrichments)