CVE-2026-98457 (GCVE-0-2026-98457)
Vulnerability from cvelistv5
Published
2026-10-18 15:15
Modified
2026-10-19 09:19
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: validate frame length before control and FCS access l2cap_data_rcv() unpacks either a two-byte or four-byte control field without first ensuring that it is present. A short ERTM or streaming-mode frame can therefore cause an out-of-bounds read. There is a second short-frame case when CRC16 is enabled. After the control field is pulled, l2cap_check_fcs() subtracts two from skb->len without checking it. If fewer than two bytes remain, the subtraction wraps; skb_trim() leaves the buffer unchanged and the subsequent FCS load reads past the logical end of the frame. Validate that the frame contains both its control field and, when enabled, its FCS before either field is accessed.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a
Version: 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a
Version: 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a
Version: 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a
Version: 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a
Version: 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a
Version: 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a
Version: 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/l2cap_core.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "2.6.32"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
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            },
            {
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              "status": "unaffected",
              "version": "5.15.222",
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            },
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              "status": "unaffected",
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              "version": "6.12.112",
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: validate frame length before control and FCS access\n\nl2cap_data_rcv() unpacks either a two-byte or four-byte control field\nwithout first ensuring that it is present. A short ERTM or streaming-mode\nframe can therefore cause an out-of-bounds read.\n\nThere is a second short-frame case when CRC16 is enabled. After the\ncontrol field is pulled, l2cap_check_fcs() subtracts two from skb-\u003elen\nwithout checking it. If fewer than two bytes remain, the subtraction\nwraps; skb_trim() leaves the buffer unchanged and the subsequent FCS\nload reads past the logical end of the frame.\n\nValidate that the frame contains both its control field and, when\nenabled, its FCS before either field is accessed."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:19:53.885Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4373ba79a267947e771c438507f7b103e30bdb21"
        },
        {
          "url": "https://git.kernel.org/stable/c/965bd88ed4b4763cb765dd65885adcfa588c6b14"
        },
        {
          "url": "https://git.kernel.org/stable/c/3acf6a0038ec0d4e8f4dcbfc2a557dff5f61cb70"
        },
        {
          "url": "https://git.kernel.org/stable/c/8c7556c7cd17e073bbefdc4a9a4694a207544c37"
        },
        {
          "url": "https://git.kernel.org/stable/c/1fdbb2a712a9a162ee817c959740face80b3d929"
        },
        {
          "url": "https://git.kernel.org/stable/c/c6a288e6001bcce16553c3853e0f5a45eaaf85c7"
        },
        {
          "url": "https://git.kernel.org/stable/c/f557274af7b94b6134692e6f26b880f1e34c15bf"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c78a213d9070b610c7f418af2c25b66180b7e37"
        }
      ],
      "title": "Bluetooth: L2CAP: validate frame length before control and FCS access",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98457",
    "datePublished": "2026-10-18T15:15:06.718Z",
    "dateReserved": "2026-09-25T10:25:14.350Z",
    "dateUpdated": "2026-10-19T09:19:53.885Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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