Vulnerability-Lookup

FKIE_CVE-2026-31393

Vulnerability from fkie_nvd - Published: 2026-04-03 16:16 - Updated: 2026-10-19 19:17

Severity

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

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access l2cap_information_rsp() checks that cmd_len covers the fixed l2cap_info_rsp header (type + result, 4 bytes) but then reads rsp->data without verifying that the payload is present: - L2CAP_IT_FEAT_MASK calls get_unaligned_le32(rsp->data), which reads 4 bytes past the header (needs cmd_len >= 8). - L2CAP_IT_FIXED_CHAN reads rsp->data[0], 1 byte past the header (needs cmd_len >= 5). A truncated L2CAP_INFO_RSP with result == L2CAP_IR_SUCCESS triggers an out-of-bounds read of adjacent skb data. Guard each data access with the required payload length check. If the payload is too short, skip the read and let the state machine complete with safe defaults (feat_mask and remote_fixed_chan remain zero from kzalloc), so the info timer cleanup and l2cap_conn_start() still run and the connection is not stalled.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/187e6fe939295be36063a1d91f8bebee04399a8c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3b646516cba2ebc4b51a72954903326e7c1e443f	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5229e7d15771eac2b5886bfb1f976aea0c1eec14	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/807bd1258453c4c83f6ae9dbc1e7b44860ff40d0	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9aeacde4da0f02d42fd968fd32f245828b230171	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/db2872d054e467810078e2b9f440a5b326a601b2	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/dd815e6e3918dc75a49aaabac36e4f024d675101	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e7ff754e339e3d5ce29aa9f95352d0186df8fbd9	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	*
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/l2cap_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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            },
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              "versionType": "git"
            },
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              "versionType": "git"
            },
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              "status": "affected",
              "version": "4e8402a3f884427f9233ba436459c158d1f2e114",
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            },
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            }
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        },
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          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.24"
            },
            {
              "lessThan": "2.6.24",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.78",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.20",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16",
              "vulnerable": true
            },
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              "vulnerable": true
            },
            {
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              "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*",
              "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access\n\nl2cap_information_rsp() checks that cmd_len covers the fixed\nl2cap_info_rsp header (type + result, 4 bytes) but then reads\nrsp-\u003edata without verifying that the payload is present:\n\n - L2CAP_IT_FEAT_MASK calls get_unaligned_le32(rsp-\u003edata), which reads\n   4 bytes past the header (needs cmd_len \u003e= 8).\n\n - L2CAP_IT_FIXED_CHAN reads rsp-\u003edata[0], 1 byte past the header\n   (needs cmd_len \u003e= 5).\n\nA truncated L2CAP_INFO_RSP with result == L2CAP_IR_SUCCESS triggers an\nout-of-bounds read of adjacent skb data.\n\nGuard each data access with the required payload length check.  If the\npayload is too short, skip the read and let the state machine complete\nwith safe defaults (feat_mask and remote_fixed_chan remain zero from\nkzalloc), so the info timer cleanup and l2cap_conn_start() still run\nand the connection is not stalled."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: L2CAP: Validar la longitud de la carga \u00fatil de L2CAP_INFO_RSP antes del acceso\n\nl2cap_information_rsp() comprueba que cmd_len cubre la cabecera fija de l2cap_info_rsp (tipo + resultado, 4 bytes) pero luego lee rsp -\u003e data sin verificar que la carga \u00fatil est\u00e9 presente:\n\n - L2CAP_IT_FEAT_MASK llama a get_unaligned_le32(rsp -\u003e data), que lee 4 bytes despu\u00e9s de la cabecera (necesita cmd_len \u003e= 8).\n\n - L2CAP_IT_FIXED_CHAN lee rsp -\u003e data[0], 1 byte despu\u00e9s de la cabecera (necesita cmd_len \u003e= 5).\n\nUn L2CAP_INFO_RSP truncado con result == L2CAP_IR_SUCCESS desencadena una lectura fuera de l\u00edmites de datos skb adyacentes.\n\nProteger cada acceso a datos con la comprobaci\u00f3n de longitud de carga \u00fatil requerida. Si la carga \u00fatil es demasiado corta, omitir la lectura y permitir que la m\u00e1quina de estados se complete con valores predeterminados seguros (feat_mask y remote_fixed_chan permanecen en cero desde kzalloc), para que la limpieza del temporizador de informaci\u00f3n y l2cap_conn_start() sigan ejecut\u00e1ndose y la conexi\u00f3n no se estanque."
    }
  ],
  "id": "CVE-2026-31393",
  "lastModified": "2026-10-19T19:17:51.010",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.2,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-31393",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-16T15:08:44.591333Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-03T16:16:37.420",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/187e6fe939295be36063a1d91f8bebee04399a8c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3b646516cba2ebc4b51a72954903326e7c1e443f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/5229e7d15771eac2b5886bfb1f976aea0c1eec14"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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    },
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/db2872d054e467810078e2b9f440a5b326a601b2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}

CVE-2026-31393 (GCVE-0-2026-31393)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-10-19 18:35

Title

Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access

Summary

Severity

8.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-16 15:08 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6639 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/187e6fe939295be36…
https://git.kernel.org/stable/c/5229e7d15771eac2b…
https://git.kernel.org/stable/c/3b646516cba2ebc4b…
https://git.kernel.org/stable/c/807bd1258453c4c83…
https://git.kernel.org/stable/c/9aeacde4da0f02d42…
https://git.kernel.org/stable/c/e7ff754e339e3d5ce…
https://git.kernel.org/stable/c/db2872d054e467810…
https://git.kernel.org/stable/c/dd815e6e3918dc75a…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 4e8402a3f884427f9233ba436459c158d1f2e114 , < 187e6fe939295be36063a1d91f8bebee04399a8c (git) Affected: 4e8402a3f884427f9233ba436459c158d1f2e114 , < 5229e7d15771eac2b5886bfb1f976aea0c1eec14 (git) Affected: 4e8402a3f884427f9233ba436459c158d1f2e114 , < 3b646516cba2ebc4b51a72954903326e7c1e443f (git) Affected: 4e8402a3f884427f9233ba436459c158d1f2e114 , < 807bd1258453c4c83f6ae9dbc1e7b44860ff40d0 (git) Affected: 4e8402a3f884427f9233ba436459c158d1f2e114 , < 9aeacde4da0f02d42fd968fd32f245828b230171 (git) Affected: 4e8402a3f884427f9233ba436459c158d1f2e114 , < e7ff754e339e3d5ce29aa9f95352d0186df8fbd9 (git) Affected: 4e8402a3f884427f9233ba436459c158d1f2e114 , < db2872d054e467810078e2b9f440a5b326a601b2 (git) Affected: 4e8402a3f884427f9233ba436459c158d1f2e114 , < dd815e6e3918dc75a49aaabac36e4f024d675101 (git)
Linux	Linux	Affected: 2.6.24 Unaffected: 0 , < 2.6.24 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.167 , ≤ 6.1.* (semver) Unaffected: 6.6.130 , ≤ 6.6.* (semver) Unaffected: 6.12.78 , ≤ 6.12.* (semver) Unaffected: 6.18.20 , ≤ 6.18.* (semver) Unaffected: 6.19.10 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-31393",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T15:08:44.591333Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-125",
                "description": "CWE-125 Out-of-bounds Read",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-19T18:35:46.203Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/l2cap_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "187e6fe939295be36063a1d91f8bebee04399a8c",
              "status": "affected",
              "version": "4e8402a3f884427f9233ba436459c158d1f2e114",
              "versionType": "git"
            },
            {
              "lessThan": "5229e7d15771eac2b5886bfb1f976aea0c1eec14",
              "status": "affected",
              "version": "4e8402a3f884427f9233ba436459c158d1f2e114",
              "versionType": "git"
            },
            {
              "lessThan": "3b646516cba2ebc4b51a72954903326e7c1e443f",
              "status": "affected",
              "version": "4e8402a3f884427f9233ba436459c158d1f2e114",
              "versionType": "git"
            },
            {
              "lessThan": "807bd1258453c4c83f6ae9dbc1e7b44860ff40d0",
              "status": "affected",
              "version": "4e8402a3f884427f9233ba436459c158d1f2e114",
              "versionType": "git"
            },
            {
              "lessThan": "9aeacde4da0f02d42fd968fd32f245828b230171",
              "status": "affected",
              "version": "4e8402a3f884427f9233ba436459c158d1f2e114",
              "versionType": "git"
            },
            {
              "lessThan": "e7ff754e339e3d5ce29aa9f95352d0186df8fbd9",
              "status": "affected",
              "version": "4e8402a3f884427f9233ba436459c158d1f2e114",
              "versionType": "git"
            },
            {
              "lessThan": "db2872d054e467810078e2b9f440a5b326a601b2",
              "status": "affected",
              "version": "4e8402a3f884427f9233ba436459c158d1f2e114",
              "versionType": "git"
            },
            {
              "lessThan": "dd815e6e3918dc75a49aaabac36e4f024d675101",
              "status": "affected",
              "version": "4e8402a3f884427f9233ba436459c158d1f2e114",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/l2cap_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.24"
            },
            {
              "lessThan": "2.6.24",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.78",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.20",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.253",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.203",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.167",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.130",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.78",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.20",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.10",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access\n\nl2cap_information_rsp() checks that cmd_len covers the fixed\nl2cap_info_rsp header (type + result, 4 bytes) but then reads\nrsp-\u003edata without verifying that the payload is present:\n\n - L2CAP_IT_FEAT_MASK calls get_unaligned_le32(rsp-\u003edata), which reads\n   4 bytes past the header (needs cmd_len \u003e= 8).\n\n - L2CAP_IT_FIXED_CHAN reads rsp-\u003edata[0], 1 byte past the header\n   (needs cmd_len \u003e= 5).\n\nA truncated L2CAP_INFO_RSP with result == L2CAP_IR_SUCCESS triggers an\nout-of-bounds read of adjacent skb data.\n\nGuard each data access with the required payload length check.  If the\npayload is too short, skip the read and let the state machine complete\nwith safe defaults (feat_mask and remote_fixed_chan remain zero from\nkzalloc), so the info timer cleanup and l2cap_conn_start() still run\nand the connection is not stalled."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The vulnerable parser is reached by Bluetooth BR/EDR L2CAP signaling over an ACL link, so an attacker must be within Bluetooth radio range rather than on a routed IP network.\nAC:L - The attacker controls the malformed L2CAP_INFO_RSP payload and sees the kernel\u0027s request identifier before responding. No race or unusual condition beyond establishing the Bluetooth link is required.\nPR:N - The L2CAP information exchange occurs during connection setup before L2CAP channel security/authentication gates are enforced. A malicious adjacent Bluetooth peer does not need local credentials or kernel privileges on the victim.\nUI:N - In a reasonable connectable Bluetooth deployment, the peer can trigger the receive path by establishing or participating in an ACL/L2CAP connection. No victim user action is required for the malformed response itself.\nS:U - The bug is in the kernel Bluetooth stack and impacts kernel-managed resources in the same security authority. It does not cross a VM, IOMMU, or other separate security boundary.\nC:H - The bug performs an out-of-bounds read from skb-adjacent data past the declared L2CAP_INFO_RSP payload. Under the required conservative scoring for kernel out-of-bounds reads, this is treated as high confidentiality impact.\nI:N - The flaw is an out-of-bounds read, not a write or type confusion primitive. It can corrupt protocol state selection, but does not provide a defensible arbitrary modification or code execution primitive.\nA:H - Reading past the valid skb data can trigger a kernel fault, KASAN report, oops, or panic on hardened/debug configurations. An adjacent peer can repeat the malformed response during connection setup, so availability impact is high."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:22:04.813Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/187e6fe939295be36063a1d91f8bebee04399a8c"
        },
        {
          "url": "https://git.kernel.org/stable/c/5229e7d15771eac2b5886bfb1f976aea0c1eec14"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b646516cba2ebc4b51a72954903326e7c1e443f"
        },
        {
          "url": "https://git.kernel.org/stable/c/807bd1258453c4c83f6ae9dbc1e7b44860ff40d0"
        },
        {
          "url": "https://git.kernel.org/stable/c/9aeacde4da0f02d42fd968fd32f245828b230171"
        },
        {
          "url": "https://git.kernel.org/stable/c/e7ff754e339e3d5ce29aa9f95352d0186df8fbd9"
        },
        {
          "url": "https://git.kernel.org/stable/c/db2872d054e467810078e2b9f440a5b326a601b2"
        },
        {
          "url": "https://git.kernel.org/stable/c/dd815e6e3918dc75a49aaabac36e4f024d675101"
        }
      ],
      "title": "Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31393",
    "datePublished": "2026-04-03T15:15:58.142Z",
    "dateReserved": "2026-03-09T15:48:24.085Z",
    "dateUpdated": "2026-10-19T18:35:46.203Z",
    "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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