CVE-2026-31512 (GCVE-0-2026-31512)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-11-05 21:45
VLAI
Title
Bluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv()
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv() l2cap_ecred_data_rcv() reads the SDU length field from skb->data using get_unaligned_le16() without first verifying that skb contains at least L2CAP_SDULEN_SIZE (2) bytes. When skb->len is less than 2, this reads past the valid data in the skb. The ERTM reassembly path correctly calls pskb_may_pull() before reading the SDU length (l2cap_reassemble_sdu, L2CAP_SAR_START case). Apply the same validation to the Enhanced Credit Based Flow Control data path.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-05 21:36 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: aac23bf636593cc2d67144aed373a46a1a5f76b1 , < cef09691cfb61f6c91cc27c3d69634f81c8ab949 (git)
Affected: aac23bf636593cc2d67144aed373a46a1a5f76b1 , < 3340be2bafdcc806f048273ea6d8e82a6597aa1b (git)
Affected: aac23bf636593cc2d67144aed373a46a1a5f76b1 , < e47315b84d0eb188772c3ff5cf073cdbdefca6b4 (git)
Affected: aac23bf636593cc2d67144aed373a46a1a5f76b1 , < 477ad4976072056c348937e94f24583321938df4 (git)
Affected: aac23bf636593cc2d67144aed373a46a1a5f76b1 , < 40c7f7eea2f4d9cb0b3e924254c8c9053372168f (git)
Affected: aac23bf636593cc2d67144aed373a46a1a5f76b1 , < 8c96f3bd4ae0802db90630be8e9851827e9c9209 (git)
Affected: aac23bf636593cc2d67144aed373a46a1a5f76b1 , < 5ad981249be52f5e4e92e0e97b436b569071cb86 (git)
Affected: aac23bf636593cc2d67144aed373a46a1a5f76b1 , < c65bd945d1c08c3db756821b6bf9f1c4a77b29c6 (git)
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Linux Linux Affected: 3.14
Unaffected: 0 , < 3.14 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.131 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv()\n\nl2cap_ecred_data_rcv() reads the SDU length field from skb-\u003edata using\nget_unaligned_le16() without first verifying that skb contains at least\nL2CAP_SDULEN_SIZE (2) bytes. When skb-\u003elen is less than 2, this reads\npast the valid data in the skb.\n\nThe ERTM reassembly path correctly calls pskb_may_pull() before reading\nthe SDU length (l2cap_reassemble_sdu, L2CAP_SAR_START case). Apply the\nsame validation to the Enhanced Credit Based Flow Control data path."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: L2CAP: Validar la longitud de la PDU antes de leer la longitud de la SDU en l2cap_ecred_data_rcv()\n\nl2cap_ecred_data_rcv() lee el campo de longitud de la SDU de skb  -\u003e  data usando get_unaligned_le16() sin verificar primero que skb contenga al menos L2CAP_SDULEN_SIZE (2) bytes. Cuando skb  -\u003e  len es menor que 2, esto lee m\u00e1s all\u00e1 de los datos v\u00e1lidos en el skb.\n\nLa ruta de reensamblaje ERTM llama correctamente a pskb_may_pull() antes de leer la longitud de la SDU (l2cap_reassemble_sdu, caso L2CAP_SAR_START). Aplicar la misma validaci\u00f3n a la ruta de datos de Control de Flujo Basado en Cr\u00e9dito Mejorado."
          }
        ],
        "id": "CVE-2026-31512",
        "lastModified": "2026-11-11T23:10:00.263",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
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              "ssvcData": {
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                "options": [
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                  {
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                  {
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-11-05T21:36:21.853077Z",
                "version": "2.0.3"
              }
            }
          ]
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        "published": "2026-04-22T14:16:50.490",
        "references": [
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            "tags": [
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            "url": "https://git.kernel.org/stable/c/e47315b84d0eb188772c3ff5cf073cdbdefca6b4"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-07T04:18:02+00:00",
      "cve": "CVE-2026-31512",
      "id": "CVE-2026-31512",
      "initial_release_date": "2026-04-22T00:00:00+00:00",
      "product_status:known_affected": "186",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31512.json",
      "version": "3"
    },
    "vulnrichment": {
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            "metrics": [
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                    "id": "CVE-2026-31512",
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                      {
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                      }
                    ],
                    "role": "CISA Coordinator",
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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              "product": "Linux",
              "programFiles": [
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              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
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                  "version": "3.14"
                },
                {
                  "lessThan": "3.14",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
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                  "version": "5.15.203",
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                  "version": "7.0",
                  "versionType": "original_commit_for_fix"
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          "cpeApplicability": [
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          "descriptions": [
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              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv()\n\nl2cap_ecred_data_rcv() reads the SDU length field from skb-\u003edata using\nget_unaligned_le16() without first verifying that skb contains at least\nL2CAP_SDULEN_SIZE (2) bytes. When skb-\u003elen is less than 2, this reads\npast the valid data in the skb.\n\nThe ERTM reassembly path correctly calls pskb_may_pull() before reading\nthe SDU length (l2cap_reassemble_sdu, L2CAP_SAR_START case). Apply the\nsame validation to the Enhanced Credit Based Flow Control data path."
            }
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            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "title": "Bluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv()",
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        "datePublished": "2026-04-22T13:54:30.171Z",
        "dateReserved": "2026-03-09T15:48:24.107Z",
        "dateUpdated": "2026-11-05T21:45:04.404Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
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    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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