{"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"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.1.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.6.143"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.12.94"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.18.36"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "7.0.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "7.1"}]}]}], "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", "x_generator": {"engine": "bippy-1.2.0"}}}}

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