{"id":"CVE-2026-63995","revision":"c5af088953bb41269048fdba58e5b531","records":[{"revision":"c5af088953bb41269048fdba58e5b531","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-63995","aliases":[],"title":"ethtool: cmis: validate start_cmd_payload_size from module","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nethtool: cmis: validate start_cmd_payload_size from module\n\nThe CMIS firmware update code reads start_cmd_payload_size from\nthe module's FW Management Features CDB reply and uses it directly\nas the byte count for memcpy. The destination buffer is 112 bytes\n(ETHTOOL_CMIS_CDB_LPL_MAX_PL_LENGTH - 8). So a malicious\nmodule (or corrupted response) can cause a OOB write later on in\ncmis_fw_update_start_download().\n\nLet's error out. If modules that expect longer LPL writes actually\nexist we should revisit.\n\nstruct cmis_cdb_start_fw_download_pl's definition has to move,\nno change there.","state":0,"publishedAt":"2026-07-19T14:56:14.58+00:00","modifiedAt":"2026-10-19T20:18:01.681+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/ethtool/cmis_fw_update.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"c4f78134d45c9619339c96b4bea380b1d0699788\",\n                            \"lessThan\": \"63112b4515469d00008452d9cfe3fb3bf1aa2df3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c4f78134d45c9619339c96b4bea380b1d0699788\",\n                            \"lessThan\": \"0696709e951be54c699664adf546d16e28974d53\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c4f78134d45c9619339c96b4bea380b1d0699788\",\n                            \"lessThan\": \"a46340da00385be7fb16c62425ebc20006f2d5d8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c4f78134d45c9619339c96b4bea380b1d0699788\",\n                            \"lessThan\": \"12c2496a71f82f63617971ca9b730dffa05cf58b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/ethtool/cmis_fw_update.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.11\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.11\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.93\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.35\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.12\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/63112b4515469d00008452d9cfe3fb3bf1aa2df3","https://git.kernel.org/stable/c/0696709e951be54c699664adf546d16e28974d53","https://git.kernel.org/stable/c/a46340da00385be7fb16c62425ebc20006f2d5d8","https://git.kernel.org/stable/c/12c2496a71f82f63617971ca9b730dffa05cf58b"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63995","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-63995","identifiers":["CVE-2026-63995"]},"retained":false,"historicalAffected":[]}],"coverage":[]}