{"id":"CVE-2026-63995","summary":"ethtool: cmis: validate start_cmd_payload_size from module","details":"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.","modified":"2026-07-22T05:29:45.895074764Z","published":"2026-07-19T14:56:14.580Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63995.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0696709e951be54c699664adf546d16e28974d53"},{"type":"WEB","url":"https://git.kernel.org/stable/c/12c2496a71f82f63617971ca9b730dffa05cf58b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/63112b4515469d00008452d9cfe3fb3bf1aa2df3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a46340da00385be7fb16c62425ebc20006f2d5d8"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63995.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63995"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"c4f78134d45c9619339c96b4bea380b1d0699788"},{"fixed":"63112b4515469d00008452d9cfe3fb3bf1aa2df3"},{"fixed":"0696709e951be54c699664adf546d16e28974d53"},{"fixed":"a46340da00385be7fb16c62425ebc20006f2d5d8"},{"fixed":"12c2496a71f82f63617971ca9b730dffa05cf58b"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63995.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.11.0"},{"fixed":"6.12.93"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.35"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.12"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63995.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}