CVE-2026-43062 (GCVE-0-2026-43062)
Vulnerability from cvelistv5
Published
2026-05-05 15:17
Modified
2026-08-05 12:25
Severity ?
7.1 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 15f02b91056253e8cdc592888f431da0731337b8
Version: 15f02b91056253e8cdc592888f431da0731337b8
Version: 15f02b91056253e8cdc592888f431da0731337b8
Version: 15f02b91056253e8cdc592888f431da0731337b8
Version: 15f02b91056253e8cdc592888f431da0731337b8
Version: 15f02b91056253e8cdc592888f431da0731337b8
Version: 15f02b91056253e8cdc592888f431da0731337b8
Version: 15f02b91056253e8cdc592888f431da0731337b8
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{
  "containers": {
    "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": "21d3ba696918d6373233aac0b9d51fcabdedddc0",
              "status": "affected",
              "version": "15f02b91056253e8cdc592888f431da0731337b8",
              "versionType": "git"
            },
            {
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              "version": "15f02b91056253e8cdc592888f431da0731337b8",
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            {
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              "versionType": "git"
            },
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            }
          ]
        },
        {
          "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": "5.7"
            },
            {
              "lessThan": "5.7",
              "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": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.203",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.167",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.130",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.78",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.20",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.10",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - Bluetooth L2CAP is reachable only by a nearby Bluetooth LE peer over the local radio link, not over routed IP networks.\nAC:L - Once an LE L2CAP ECRED channel/reconfiguration exchange exists, the attacker controls the response length and bytes; no hard-to-win race or environmental condition is required to hit the misparse.\nPR:N - The inbound HCI ACL/L2CAP signaling receive path has no local privilege or authentication check before parsing the peer\u0027s ECRED reconfiguration response.\nUI:N - No victim user action is required for packet processing beyond the system participating in a Bluetooth LE L2CAP session.\nS:U - The impact remains within the kernel/Bluetooth stack security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:N - The wrong struct makes the kernel read the result from attacker-controlled packet bytes at offset 6 after an 8-byte length check, so this commit does not expose kernel memory.\nI:H - The bug is a kernel protocol-parser type confusion that lets an adjacent peer drive incorrect ECRED reconfiguration state and channel teardown based on the wrong field; per the supplied guidance, type confusion is scored High for integrity.\nA:L - The practical availability impact is disruption or failure of ECRED reconfiguration/channel state, not a demonstrated kernel panic, hang, or whole-system crash from this fix."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:25:40.332Z",
        "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"
        },
        {
          "url": "https://git.kernel.org/stable/c/dd3b221e21079ade8263fbb7176f3d55ad75d3b6"
        },
        {
          "url": "https://git.kernel.org/stable/c/d90150c72d2e6a8a3079e88755dafcfbe91c746d"
        },
        {
          "url": "https://git.kernel.org/stable/c/5a1ea296f8589ce8f1e3141b2b123b34ad010e19"
        },
        {
          "url": "https://git.kernel.org/stable/c/f110b8f58b254bf997cec1bd60701b7798e9bb82"
        },
        {
          "url": "https://git.kernel.org/stable/c/15145675690cab2de1056e7ed68e59cbd0452529"
        }
      ],
      "title": "Bluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43062",
    "datePublished": "2026-05-05T15:17:27.830Z",
    "dateReserved": "2026-05-01T14:12:55.981Z",
    "dateUpdated": "2026-08-05T12:25:40.332Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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