{"api_version":"1","generated_at":"2026-07-24T20:14:24+00:00","cve":"CVE-2026-63868","urls":{"html":"https://cve.report/CVE-2026-63868","api":"https://cve.report/api/cve/CVE-2026-63868.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63868","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63868"},"summary":{"title":"net: garp: fix unsigned integer underflow in garp_pdu_parse_attr","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 15:16:53","updated_at":"2026-07-19 15:16:53"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/d4c86ea09ae3e63ee5aa86e941fcc38e0e39874a","name":"https://git.kernel.org/stable/c/d4c86ea09ae3e63ee5aa86e941fcc38e0e39874a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/74e02121be1dcc0efcd56ebdf0171d6129105659","name":"https://git.kernel.org/stable/c/74e02121be1dcc0efcd56ebdf0171d6129105659","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/04e22fefac1af3e32f245e9045382348773b5d59","name":"https://git.kernel.org/stable/c/04e22fefac1af3e32f245e9045382348773b5d59","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/973cf7c433d27f4d9556d0b7c332543be7ed7a6e","name":"https://git.kernel.org/stable/c/973cf7c433d27f4d9556d0b7c332543be7ed7a6e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a11f1a671b1361f0f1278dc0041374f2730df73f","name":"https://git.kernel.org/stable/c/a11f1a671b1361f0f1278dc0041374f2730df73f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d8dcd14aa886b8effd83022c550669f4f262854b","name":"https://git.kernel.org/stable/c/d8dcd14aa886b8effd83022c550669f4f262854b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/16e408e607a94b646fb14a2a98422c6877ae4b3c","name":"https://git.kernel.org/stable/c/16e408e607a94b646fb14a2a98422c6877ae4b3c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/29f28172afb2ae7b31e9bf3e978396f20b381688","name":"https://git.kernel.org/stable/c/29f28172afb2ae7b31e9bf3e978396f20b381688","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63868","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63868","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected eca9ebac651f774d8b10fce7c5d173c3c3d3394f 29f28172afb2ae7b31e9bf3e978396f20b381688 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected eca9ebac651f774d8b10fce7c5d173c3c3d3394f 973cf7c433d27f4d9556d0b7c332543be7ed7a6e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected eca9ebac651f774d8b10fce7c5d173c3c3d3394f d8dcd14aa886b8effd83022c550669f4f262854b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected eca9ebac651f774d8b10fce7c5d173c3c3d3394f 74e02121be1dcc0efcd56ebdf0171d6129105659 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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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."}],"providerMetadata":{"dateUpdated":"2026-07-19T14:18:37.823Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-63868","datePublished":"2026-07-19T14:18:37.823Z","dateReserved":"2026-07-19T07:54:57.017Z","dateUpdated":"2026-07-19T14:18:37.823Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 15:16:53","lastModifiedDate":"2026-07-19 15:16:53","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63868","Ordinal":"1","Title":"net: garp: fix unsigned integer underflow in garp_pdu_parse_attr","CVE":"CVE-2026-63868","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63868","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"net: garp: fix unsigned integer underflow in garp_pdu_parse_attr"}]}}}