Vulnerability-Lookup

FKIE_CVE-2026-64126

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-08-13 15:11

Severity

7.3 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

Summary

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.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0bc1a5a69f541859293d79db72bd7854ac48df51	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0d5104390b445e7bd664ad583837e4c04d892c9d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/14b01b9cba04e6ce82825f68fc4c4322fa4ffa43	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a143ce77a5292f2c9285137433d879ce71d190a7	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a6c75a3fad226ccbd8ef9110dee87c92c299f2ab	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d3f7d17960ed50df3a6709c5158caff989c8c905	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f1febe93ef075314615f970a87681d9ab86691d1	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1

JSON

To clipboard

{
  "affected": [
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      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/mgmt.c"
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    {
      "lang": "en",
      "value": "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.  The handler\nthen uses cp-\u003eadv_data_len and cp-\u003escan_rsp_len to validate and copy\ncp-\u003edata, 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-\u003edata."
    }
  ],
  "id": "CVE-2026-64126",
  "lastModified": "2026-08-13T15:11:16.750",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "LOW",
          "baseScore": 7.3,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.5,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
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  "published": "2026-07-19T16:17:54.260",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2026-64126 (GCVE-0-2026-64126)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-08-05 12:39

Title

Bluetooth: MGMT: validate Add Extended Advertising Data length

Summary

Severity

7.3 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

Assigner

Linux mitre root

References

7 references

URL	Tags
https://git.kernel.org/stable/c/0d5104390b445e7bd…
https://git.kernel.org/stable/c/14b01b9cba04e6ce8…
https://git.kernel.org/stable/c/a143ce77a5292f2c9…
https://git.kernel.org/stable/c/a6c75a3fad226ccbd…
https://git.kernel.org/stable/c/f1febe93ef0753146…
https://git.kernel.org/stable/c/0bc1a5a69f5418592…
https://git.kernel.org/stable/c/d3f7d17960ed50df3…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 12410572833a283ce92fcf9679ca8a2f372097ee , < 0d5104390b445e7bd664ad583837e4c04d892c9d (git) Affected: 12410572833a283ce92fcf9679ca8a2f372097ee , < 14b01b9cba04e6ce82825f68fc4c4322fa4ffa43 (git) Affected: 12410572833a283ce92fcf9679ca8a2f372097ee , < a143ce77a5292f2c9285137433d879ce71d190a7 (git) Affected: 12410572833a283ce92fcf9679ca8a2f372097ee , < a6c75a3fad226ccbd8ef9110dee87c92c299f2ab (git) Affected: 12410572833a283ce92fcf9679ca8a2f372097ee , < f1febe93ef075314615f970a87681d9ab86691d1 (git) Affected: 12410572833a283ce92fcf9679ca8a2f372097ee , < 0bc1a5a69f541859293d79db72bd7854ac48df51 (git) Affected: 12410572833a283ce92fcf9679ca8a2f372097ee , < d3f7d17960ed50df3a6709c5158caff989c8c905 (git)
Linux	Linux	Affected: 5.11 Unaffected: 0 , < 5.11 (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.142 , ≤ 6.6.* (semver) Unaffected: 6.12.92 , ≤ 6.12.* (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/mgmt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "value": "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.  The handler\nthen uses cp-\u003eadv_data_len and cp-\u003escan_rsp_len to validate and copy\ncp-\u003edata, 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-\u003edata."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only through a local Bluetooth MGMT socket (AF_BLUETOOTH, HCI_CHANNEL_CONTROL) via sendmsg(), not from remote Bluetooth air traffic or network protocols.\nAC:L - An attacker fully controls the malformed MGMT command and length fields and can retry reliably; no race or victim-dependent timing is required to trigger the out-of-bounds read and copy.\nPR:L - Exploitation requires CAP_NET_ADMIN to obtain an HCI_SOCK_TRUSTED MGMT socket, which is reachable by an unprivileged user via user namespaces (e.g. unshare with CAP_NET_ADMIN) on the CONTROL-channel bind path.\nUI:N - No victim interaction is required; the attacker triggers the flaw directly by sending a crafted MGMT_OP_ADD_EXT_ADV_DATA command.\nS:U - Impact is confined to kernel memory disclosure and modification of Bluetooth advertising state within the same kernel security boundary, with no VM escape or cross-authority boundary crossing.\nC:H - A short command causes slab out-of-bounds reads (KASAN-reported) via tlv_data_is_valid(), and addressable bytes beyond the command buffer can be copied into scan response data and potentially exfiltrated over BLE advertising.\nI:H - The out-of-bounds pointer is used in memcpy() into kernel advertising structures, constituting kernel memory corruption with attacker-influenced content that can alter system-controlled Bluetooth data.\nA:L - While the primary impact is information disclosure, out-of-bounds kernel memory access can cause oopses or instability on some layouts; when uncertain, availability impact is rated above none."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:39:32.975Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
        }
      ],
      "title": "Bluetooth: MGMT: validate Add Extended Advertising Data length",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64126",
    "datePublished": "2026-07-19T15:40:23.276Z",
    "dateReserved": "2026-07-19T07:54:57.036Z",
    "dateUpdated": "2026-08-05T12:39:32.975Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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FKIE_CVE-2026-64126

CVE-2026-64126 (GCVE-0-2026-64126)

Tags

Sightings

Nomenclature