{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-63868",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T07:54:57.017Z",
        "datePublished": "2026-07-19T14:18:37.823Z",
        "dateUpdated": "2026-07-19T14:18:37.823Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-07-19T14:18:37.823Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: garp: fix unsigned integer underflow in garp_pdu_parse_attr\n\nThe receive-side GARP attribute parser computes dlen with reversed\noperands:\n\n        dlen = sizeof(*ga) - ga->len;\n\nga->len is the on-wire attribute length and includes the GARP attribute\nheader. For normal attributes with data, ga->len is larger than\nsizeof(*ga), so the subtraction underflows in unsigned arithmetic.\n\nThe resulting value is later passed to garp_attr_lookup(), whose length\nargument is u8. After truncation, the parsed data length usually no\nlonger matches the length stored for locally registered attributes, so\nreceived Join/Leave events are ignored. This breaks the GARP receive path\nfor common attributes, such as GVRP VLAN registration attributes.\n\nCompute the data length as the attribute length minus the header length."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/802/garp.c"
                    ],
                    "versions": [
                        {
                            "version": "eca9ebac651f774d8b10fce7c5d173c3c3d3394f",
                            "lessThan": "29f28172afb2ae7b31e9bf3e978396f20b381688",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "eca9ebac651f774d8b10fce7c5d173c3c3d3394f",
                            "lessThan": "973cf7c433d27f4d9556d0b7c332543be7ed7a6e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "eca9ebac651f774d8b10fce7c5d173c3c3d3394f",
                            "lessThan": "d8dcd14aa886b8effd83022c550669f4f262854b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "eca9ebac651f774d8b10fce7c5d173c3c3d3394f",
                            "lessThan": "74e02121be1dcc0efcd56ebdf0171d6129105659",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "eca9ebac651f774d8b10fce7c5d173c3c3d3394f",
                            "lessThan": "d4c86ea09ae3e63ee5aa86e941fcc38e0e39874a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "eca9ebac651f774d8b10fce7c5d173c3c3d3394f",
                            "lessThan": "04e22fefac1af3e32f245e9045382348773b5d59",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "eca9ebac651f774d8b10fce7c5d173c3c3d3394f",
                            "lessThan": "a11f1a671b1361f0f1278dc0041374f2730df73f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "eca9ebac651f774d8b10fce7c5d173c3c3d3394f",
                            "lessThan": "16e408e607a94b646fb14a2a98422c6877ae4b3c",
                            "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/802/garp.c"
                    ],
                    "versions": [
                        {
                            "version": "2.6.27",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.27",
                            "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": "2.6.27",
                                    "versionEndExcluding": "5.10.259"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.27",
                                    "versionEndExcluding": "5.15.210"
                                },
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                                },
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                                    "versionStartIncluding": "2.6.27",
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                                },
                                {
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                                    "versionStartIncluding": "2.6.27",
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.27",
                                    "versionEndExcluding": "7.1"
                                }
                            ]
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                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/29f28172afb2ae7b31e9bf3e978396f20b381688"
                },
                {
                    "url": "https://git.kernel.org/stable/c/973cf7c433d27f4d9556d0b7c332543be7ed7a6e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d8dcd14aa886b8effd83022c550669f4f262854b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/74e02121be1dcc0efcd56ebdf0171d6129105659"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d4c86ea09ae3e63ee5aa86e941fcc38e0e39874a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/04e22fefac1af3e32f245e9045382348773b5d59"
                },
                {
                    "url": "https://git.kernel.org/stable/c/a11f1a671b1361f0f1278dc0041374f2730df73f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/16e408e607a94b646fb14a2a98422c6877ae4b3c"
                }
            ],
            "title": "net: garp: fix unsigned integer underflow in garp_pdu_parse_attr",
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}