{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-53263",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-06-09T07:44:35.394Z",
        "datePublished": "2026-06-25T08:39:51.215Z",
        "dateUpdated": "2026-06-25T08:39:51.215Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-06-25T08:39:51.215Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\n6lowpan: fix off-by-one in multicast context address compression\n\nThe second memcpy in lowpan_iphc_mcast_ctx_addr_compress() uses\n&data[1] as destination and &ipaddr->s6_addr[11] as source, but\nboth should be offset by one: &data[2] and &ipaddr->s6_addr[12]\nrespectively.\n\nThis off-by-one has two consequences:\n1. data[1] is overwritten with s6_addr[11], corrupting the RIID\n   field in the compressed multicast address\n2. data[5] is never written, so uninitialized kernel stack memory\n   is transmitted over the network via lowpan_push_hc_data(),\n   leaking kernel stack contents\n\nThe correct inline data layout must match what the decompression\nfunction lowpan_uncompress_multicast_ctx_daddr() expects:\n  data[0..1] = s6_addr[1..2]  (flags/scope + RIID)\n  data[2..5] = s6_addr[12..15] (group ID)\n\nAlso zero-initialize the data array as a defensive measure against\nsimilar bugs in the future."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/6lowpan/iphc.c"
                    ],
                    "versions": [
                        {
                            "version": "5609c185f24dffca5f6a9c127106869da150be03",
                            "lessThan": "f24a58c72a45f4c109f3557a760cc4b60b7a6037",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5609c185f24dffca5f6a9c127106869da150be03",
                            "lessThan": "da8cbb64b47e9066b40af0de170901caf17b768c",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5609c185f24dffca5f6a9c127106869da150be03",
                            "lessThan": "4485d79617520d84ba5a14515e2b5136007d6deb",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5609c185f24dffca5f6a9c127106869da150be03",
                            "lessThan": "06ce6fc106b16dec9b535950db626261be865e5b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5609c185f24dffca5f6a9c127106869da150be03",
                            "lessThan": "dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5609c185f24dffca5f6a9c127106869da150be03",
                            "lessThan": "c32f30ef5e66adbfa102348e2e8a23776eb007cb",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5609c185f24dffca5f6a9c127106869da150be03",
                            "lessThan": "da8808463882c3f3c357b072e25053c2121f1419",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5609c185f24dffca5f6a9c127106869da150be03",
                            "lessThan": "2a58899d11009bffc7b4b32a571858f381121837",
                            "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/6lowpan/iphc.c"
                    ],
                    "versions": [
                        {
                            "version": "4.6",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.6",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.259",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.210",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.176",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.143",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.94",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.36",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.13",
                            "lessThanOrEqual": "7.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1",
                            "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": "4.6",
                                    "versionEndExcluding": "5.10.259"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.6",
                                    "versionEndExcluding": "5.15.210"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.6",
                                    "versionEndExcluding": "6.1.176"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.6",
                                    "versionEndExcluding": "6.6.143"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.6",
                                    "versionEndExcluding": "6.12.94"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.6",
                                    "versionEndExcluding": "6.18.36"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.6",
                                    "versionEndExcluding": "7.0.13"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.6",
                                    "versionEndExcluding": "7.1"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/f24a58c72a45f4c109f3557a760cc4b60b7a6037"
                },
                {
                    "url": "https://git.kernel.org/stable/c/da8cbb64b47e9066b40af0de170901caf17b768c"
                },
                {
                    "url": "https://git.kernel.org/stable/c/4485d79617520d84ba5a14515e2b5136007d6deb"
                },
                {
                    "url": "https://git.kernel.org/stable/c/06ce6fc106b16dec9b535950db626261be865e5b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c32f30ef5e66adbfa102348e2e8a23776eb007cb"
                },
                {
                    "url": "https://git.kernel.org/stable/c/da8808463882c3f3c357b072e25053c2121f1419"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2a58899d11009bffc7b4b32a571858f381121837"
                }
            ],
            "title": "6lowpan: fix off-by-one in multicast context address compression",
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                "engine": "bippy-1.2.0"
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    }
}