{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-43020",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-05-01T14:12:55.975Z",
        "datePublished": "2026-05-01T14:15:23.699Z",
        "dateUpdated": "2026-05-11T22:16:09.294Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-11T22:16:09.294Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: validate LTK enc_size on load\n\nLoad Long Term Keys stores the user-provided enc_size and later uses\nit to size fixed-size stack operations when replying to LE LTK\nrequests. An enc_size larger than the 16-byte key buffer can therefore\noverflow the reply stack buffer.\n\nReject oversized enc_size values while validating the management LTK\nrecord so invalid keys never reach the stored key state."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/bluetooth/mgmt.c"
                    ],
                    "versions": [
                        {
                            "version": "346af67b8d116f01ef696fd47959a55deb2db8b6",
                            "lessThan": "0f37d1e65c6d71ad94ccfb5c602163c525db789d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "346af67b8d116f01ef696fd47959a55deb2db8b6",
                            "lessThan": "257cdb960d8ff6d60bb6461b03c814b6cf0c9e64",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "346af67b8d116f01ef696fd47959a55deb2db8b6",
                            "lessThan": "c34577f517b556fb6ca173d45bf7e766ae2564ce",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "346af67b8d116f01ef696fd47959a55deb2db8b6",
                            "lessThan": "f71695e81f4cb428f3c7e2138eae88199005b52c",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "346af67b8d116f01ef696fd47959a55deb2db8b6",
                            "lessThan": "82f342b3b006ca1d65f4890c05f2ec32fcb808b6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "346af67b8d116f01ef696fd47959a55deb2db8b6",
                            "lessThan": "50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "346af67b8d116f01ef696fd47959a55deb2db8b6",
                            "lessThan": "40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "346af67b8d116f01ef696fd47959a55deb2db8b6",
                            "lessThan": "b8dbe9648d69059cfe3a28917bfbf7e61efd7f15",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/bluetooth/mgmt.c"
                    ],
                    "versions": [
                        {
                            "version": "3.4",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.4",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.253",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.203",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.168",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.134",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.81",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.22",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.12",
                            "lessThanOrEqual": "6.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.4",
                                    "versionEndExcluding": "5.10.253"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.4",
                                    "versionEndExcluding": "5.15.203"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.4",
                                    "versionEndExcluding": "6.1.168"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.4",
                                    "versionEndExcluding": "6.6.134"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.4",
                                    "versionEndExcluding": "6.12.81"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.4",
                                    "versionEndExcluding": "6.18.22"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.4",
                                    "versionEndExcluding": "6.19.12"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.4",
                                    "versionEndExcluding": "7.0"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/0f37d1e65c6d71ad94ccfb5c602163c525db789d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/257cdb960d8ff6d60bb6461b03c814b6cf0c9e64"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c34577f517b556fb6ca173d45bf7e766ae2564ce"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f71695e81f4cb428f3c7e2138eae88199005b52c"
                },
                {
                    "url": "https://git.kernel.org/stable/c/82f342b3b006ca1d65f4890c05f2ec32fcb808b6"
                },
                {
                    "url": "https://git.kernel.org/stable/c/50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257"
                },
                {
                    "url": "https://git.kernel.org/stable/c/40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009"
                },
                {
                    "url": "https://git.kernel.org/stable/c/b8dbe9648d69059cfe3a28917bfbf7e61efd7f15"
                }
            ],
            "title": "Bluetooth: MGMT: validate LTK enc_size on load",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}