CVE-2026-43062 (GCVE-0-2026-43062)

Vulnerability from cvelistv5 – Published: 2026-05-05 15:17 – Updated: 2026-05-05 15:17
VLAI?
Title
Bluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp() l2cap_ecred_reconf_rsp() casts the incoming data to struct l2cap_ecred_conn_rsp (the ECRED *connection* response, 8 bytes with result at offset 6) instead of struct l2cap_ecred_reconf_rsp (2 bytes with result at offset 0). This causes two problems: - The sizeof(*rsp) length check requires 8 bytes instead of the correct 2, so valid L2CAP_ECRED_RECONF_RSP packets are rejected with -EPROTO. - rsp->result reads from offset 6 instead of offset 0, returning wrong data when the packet is large enough to pass the check. Fix by using the correct type. Also pass the already byte-swapped result variable to BT_DBG instead of the raw __le16 field.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 21d3ba696918d6373233aac0b9d51fcabdedddc0 (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 3b94e62caa1dc1198d0d55d97bd710da1dee15d7 (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 111f74547eee8cfedfb854284e80f35c8a491186 (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < dd3b221e21079ade8263fbb7176f3d55ad75d3b6 (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < d90150c72d2e6a8a3079e88755dafcfbe91c746d (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 5a1ea296f8589ce8f1e3141b2b123b34ad010e19 (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < f110b8f58b254bf997cec1bd60701b7798e9bb82 (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 15145675690cab2de1056e7ed68e59cbd0452529 (git)
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    Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (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)
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/l2cap_core.c"
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          "vendor": "Linux",
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            },
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              "version": "0",
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              "status": "unaffected",
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              "versionType": "semver"
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            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
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            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
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              "lessThanOrEqual": "6.6.*",
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
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              "version": "6.19.10",
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            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()\n\nl2cap_ecred_reconf_rsp() casts the incoming data to struct\nl2cap_ecred_conn_rsp (the ECRED *connection* response, 8 bytes with\nresult at offset 6) instead of struct l2cap_ecred_reconf_rsp (2 bytes\nwith result at offset 0).\n\nThis causes two problems:\n\n - The sizeof(*rsp) length check requires 8 bytes instead of the\n   correct 2, so valid L2CAP_ECRED_RECONF_RSP packets are rejected\n   with -EPROTO.\n\n - rsp-\u003eresult reads from offset 6 instead of offset 0, returning\n   wrong data when the packet is large enough to pass the check.\n\nFix by using the correct type.  Also pass the already byte-swapped\nresult variable to BT_DBG instead of the raw __le16 field."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-05T15:17:27.830Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/21d3ba696918d6373233aac0b9d51fcabdedddc0"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b94e62caa1dc1198d0d55d97bd710da1dee15d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/111f74547eee8cfedfb854284e80f35c8a491186"
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        {
          "url": "https://git.kernel.org/stable/c/dd3b221e21079ade8263fbb7176f3d55ad75d3b6"
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        },
        {
          "url": "https://git.kernel.org/stable/c/15145675690cab2de1056e7ed68e59cbd0452529"
        }
      ],
      "title": "Bluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43062",
    "datePublished": "2026-05-05T15:17:27.830Z",
    "dateReserved": "2026-05-01T14:12:55.981Z",
    "dateUpdated": "2026-05-05T15:17:27.830Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43062\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-05T16:16:15.340\",\"lastModified\":\"2026-05-05T16:16:15.340\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()\\n\\nl2cap_ecred_reconf_rsp() casts the incoming data to struct\\nl2cap_ecred_conn_rsp (the ECRED *connection* response, 8 bytes with\\nresult at offset 6) instead of struct l2cap_ecred_reconf_rsp (2 bytes\\nwith result at offset 0).\\n\\nThis causes two problems:\\n\\n - The sizeof(*rsp) length check requires 8 bytes instead of the\\n   correct 2, so valid L2CAP_ECRED_RECONF_RSP packets are rejected\\n   with -EPROTO.\\n\\n - rsp-\u003eresult reads from offset 6 instead of offset 0, returning\\n   wrong data when the packet is large enough to pass the check.\\n\\nFix by using the correct type.  Also pass the already byte-swapped\\nresult variable to BT_DBG instead of the raw __le16 field.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/111f74547eee8cfedfb854284e80f35c8a491186\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/15145675690cab2de1056e7ed68e59cbd0452529\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/21d3ba696918d6373233aac0b9d51fcabdedddc0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3b94e62caa1dc1198d0d55d97bd710da1dee15d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5a1ea296f8589ce8f1e3141b2b123b34ad010e19\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d90150c72d2e6a8a3079e88755dafcfbe91c746d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dd3b221e21079ade8263fbb7176f3d55ad75d3b6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f110b8f58b254bf997cec1bd60701b7798e9bb82\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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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.