CVE-2026-63996 ethtool: cmis: require exact CDB reply length

In the Linux kernel, the following vulnerability has been resolved: ethtool: cmis: require exact CDB reply length Malicious SFP module could respond with rpllen longer than what cmiscdbprocessreply expected, leading to OOB writes. Malicious HW is a bit theoretical but some modules may just be bug...

CVE-2026-63996

CVE-2026-63996 concerns the Linux kernel ethtool cmis path. The issue arises when a malicious SFP module responds with a reply length longer than what cmis_cdb_process_reply() expects, potentially causing out-of-bounds writes. The fix involves strengthening the existing length checks to also guar...