{"id":"CVE-2026-80901","summary":"ipvs: fix the checksum validations","details":"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 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.","modified":"2026-09-06T03:47:07.650529968Z","published":"2026-09-04T17:11:15.780Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80901.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/00eb23829fd08df1b5e057cb6b625996a70e7e65"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5558a85add073215b298f3e044ff9a6d86d714ae"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9cbe2c0fdb71904ee929b1851cdc1c73341a03c0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b3869d9b54e76dff64118dee4c8fd9302fcd5171"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d418d73acf8be62744dc47359dfdde8c2148845d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e876b75b9020a97bbdc79721e7fc749024891c65"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80901.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80901"},{"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":"2a3b791e6e1169f374224d164738e9f7be703d77"},{"fixed":"d418d73acf8be62744dc47359dfdde8c2148845d"},{"fixed":"b3869d9b54e76dff64118dee4c8fd9302fcd5171"},{"fixed":"9cbe2c0fdb71904ee929b1851cdc1c73341a03c0"},{"fixed":"00eb23829fd08df1b5e057cb6b625996a70e7e65"},{"fixed":"5558a85add073215b298f3e044ff9a6d86d714ae"},{"fixed":"e876b75b9020a97bbdc79721e7fc749024891c65"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80901.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.28"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.151"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.103"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.44"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80901.json"}}],"schema_version":"1.9.0"}