{"id":"CVE-2026-80901","title":"ipvs: fix the checksum validations","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: fix the checksum validations\n\nip_vs_in_icmp_v6() is missing checksum validation for ICMPv6\npackets from clients. In fact, as for TCP/UDP we should\nvalidate the ch…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 2a3b791e6e1169f374224d164738e9f7be703d77 < d418d73acf8be62744dc47359dfdde8c2148845d","Linux >= 2a3b791e6e1169f374224d164738e9f7be703d77 < b3869d9b54e76dff64118dee4c8fd9302fcd5171","Linux >= 2a3b791e6e1169f374224d164738e9f7be703d77 < 9cbe2c0fdb71904ee929b1851cdc1c73341a03c0","Linux >= 2a3b791e6e1169f374224d164738e9f7be703d77 < 00eb23829fd08df1b5e057cb6b625996a70e7e65","Linux >= 2a3b791e6e1169f374224d164738e9f7be703d77 < 5558a85add073215b298f3e044ff9a6d86d714ae","Linux >= 2a3b791e6e1169f374224d164738e9f7be703d77 < e876b75b9020a97bbdc79721e7fc749024891c65","Linux 2.6.28"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T17:04:54.112379Z"},"published":"2026-09-04","updated":"2026-11-06","sourceUpdated":"2026-11-06T17:05:56.501Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80901","references":[{"url":"https://git.kernel.org/stable/c/d418d73acf8be62744dc47359dfdde8c2148845d"},{"url":"https://git.kernel.org/stable/c/b3869d9b54e76dff64118dee4c8fd9302fcd5171"},{"url":"https://git.kernel.org/stable/c/9cbe2c0fdb71904ee929b1851cdc1c73341a03c0"},{"url":"https://git.kernel.org/stable/c/00eb23829fd08df1b5e057cb6b625996a70e7e65"},{"url":"https://git.kernel.org/stable/c/5558a85add073215b298f3e044ff9a6d86d714ae"},{"url":"https://git.kernel.org/stable/c/e876b75b9020a97bbdc79721e7fc749024891c65"}],"tags":["cve.org"],"epss":0.00161,"epssPercentile":0.05291,"ingestedAt":"2026-11-06T18:00:12.528Z","slug":"CVE-2026-80901","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nipvs: fix the checksum validations\n\nip_vs_in_icmp_v6() is missing checksum validation for ICMPv6\npackets from clients. In fact, as for TCP/UDP we should\nvalidate the checksum for ICMP packets only when we\nmangle the packets on MASQ or on reply for tunnel.\n\nAlso, Sashiko points out that handle_response_icmp() being\ncommon for IPv4 and IPv6 is missing the pseudo-header\ncalculation while validating ICMPv6 messages from real\nservers which is a problem if checksum is not validated\nby the hardware.\n\nFix the problems by creating ip_vs_checksum_common_check()\nhelper and use it for TCP/UDP/ICMP both for IPv4 and IPv6.\nRely on the nf_checksum() for validating the ICMP messages\nbut use it also for TCP and UDP.\n\nUse correct IP offset for IP_VS_DBG_RL_PKT for TCP/UDP/SCTP.\n\nIPVS packets (TCP/UDP/SCTP/ICMP) do not need checksum\nvalidation on LOCAL_OUT (local clients or local real\nservers) and on FORWARD (traffic from servers on LAN).\nDo it only on LOCAL_IN, in case nf_checksum() is not\ncalled on PRE_ROUTING.\n\nAlso, ip_vs_checksum_complete() can be marked static.\n\n## Affected\n\n- `Linux >= 2a3b791e6e1169f374224d164738e9f7be703d77 < d418d73acf8be62744dc47359dfdde8c2148845d`\n- `Linux >= 2a3b791e6e1169f374224d164738e9f7be703d77 < b3869d9b54e76dff64118dee4c8fd9302fcd5171`\n- `Linux >= 2a3b791e6e1169f374224d164738e9f7be703d77 < 9cbe2c0fdb71904ee929b1851cdc1c73341a03c0`\n- `Linux >= 2a3b791e6e1169f374224d164738e9f7be703d77 < 00eb23829fd08df1b5e057cb6b625996a70e7e65`\n- `Linux >= 2a3b791e6e1169f374224d164738e9f7be703d77 < 5558a85add073215b298f3e044ff9a6d86d714ae`\n- `Linux >= 2a3b791e6e1169f374224d164738e9f7be703d77 < e876b75b9020a97bbdc79721e7fc749024891c65`\n- `Linux 2.6.28`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}