{"id":"CVE-2026-80901","state":"PUBLISHED","title":"ipvs: fix the checksum validations","description":"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.","publishedAt":"2026-09-04T17:11:15.780Z","updatedAt":"2026-09-04T17:11:15.780Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2a3b791e6e1169f374224d164738e9f7be703d77","status":"affected","lessThan":"d418d73acf8be62744dc47359dfdde8c2148845d","versionType":"git"},{"version":"2a3b791e6e1169f374224d164738e9f7be703d77","status":"affected","lessThan":"b3869d9b54e76dff64118dee4c8fd9302fcd5171","versionType":"git"},{"version":"2a3b791e6e1169f374224d164738e9f7be703d77","status":"affected","lessThan":"9cbe2c0fdb71904ee929b1851cdc1c73341a03c0","versionType":"git"},{"version":"2a3b791e6e1169f374224d164738e9f7be703d77","status":"affected","lessThan":"00eb23829fd08df1b5e057cb6b625996a70e7e65","versionType":"git"},{"version":"2a3b791e6e1169f374224d164738e9f7be703d77","status":"affected","lessThan":"5558a85add073215b298f3e044ff9a6d86d714ae","versionType":"git"},{"version":"2a3b791e6e1169f374224d164738e9f7be703d77","status":"affected","lessThan":"e876b75b9020a97bbdc79721e7fc749024891c65","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/ip_vs.h","net/netfilter/ipvs/ip_vs_core.c","net/netfilter/ipvs/ip_vs_proto_sctp.c","net/netfilter/ipvs/ip_vs_proto_tcp.c","net/netfilter/ipvs/ip_vs_proto_udp.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.28","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.28","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.151","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/ip_vs.h","net/netfilter/ipvs/ip_vs_core.c","net/netfilter/ipvs/ip_vs_proto_sctp.c","net/netfilter/ipvs/ip_vs_proto_tcp.c","net/netfilter/ipvs/ip_vs_proto_udp.c"]}],"references":["https://git.kernel.org/stable/c/d418d73acf8be62744dc47359dfdde8c2148845d","https://git.kernel.org/stable/c/b3869d9b54e76dff64118dee4c8fd9302fcd5171","https://git.kernel.org/stable/c/9cbe2c0fdb71904ee929b1851cdc1c73341a03c0","https://git.kernel.org/stable/c/00eb23829fd08df1b5e057cb6b625996a70e7e65","https://git.kernel.org/stable/c/5558a85add073215b298f3e044ff9a6d86d714ae","https://git.kernel.org/stable/c/e876b75b9020a97bbdc79721e7fc749024891c65"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80901.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80901","state":"PUBLISHED","datePublished":"2026-09-04T17:11:15.780Z","dateUpdated":"2026-09-04T17:11:15.780Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.800Z"},"containers":{"cna":{"title":"ipvs: fix the checksum validations","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2a3b791e6e1169f374224d164738e9f7be703d77","status":"affected","lessThan":"d418d73acf8be62744dc47359dfdde8c2148845d","versionType":"git"},{"version":"2a3b791e6e1169f374224d164738e9f7be703d77","status":"affected","lessThan":"b3869d9b54e76dff64118dee4c8fd9302fcd5171","versionType":"git"},{"version":"2a3b791e6e1169f374224d164738e9f7be703d77","status":"affected","lessThan":"9cbe2c0fdb71904ee929b1851cdc1c73341a03c0","versionType":"git"},{"version":"2a3b791e6e1169f374224d164738e9f7be703d77","status":"affected","lessThan":"00eb23829fd08df1b5e057cb6b625996a70e7e65","versionType":"git"},{"version":"2a3b791e6e1169f374224d164738e9f7be703d77","status":"affected","lessThan":"5558a85add073215b298f3e044ff9a6d86d714ae","versionType":"git"},{"version":"2a3b791e6e1169f374224d164738e9f7be703d77","status":"affected","lessThan":"e876b75b9020a97bbdc79721e7fc749024891c65","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/ip_vs.h","net/netfilter/ipvs/ip_vs_core.c","net/netfilter/ipvs/ip_vs_proto_sctp.c","net/netfilter/ipvs/ip_vs_proto_tcp.c","net/netfilter/ipvs/ip_vs_proto_udp.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.28","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.28","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.151","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/ip_vs.h","net/netfilter/ipvs/ip_vs_core.c","net/netfilter/ipvs/ip_vs_proto_sctp.c","net/netfilter/ipvs/ip_vs_proto_tcp.c","net/netfilter/ipvs/ip_vs_proto_udp.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-09-04T17:11:15.780Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.28","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.28","versionEndExcluding":"6.6.151"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.28","versionEndExcluding":"6.12.103"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.28","versionEndExcluding":"6.18.44"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.28","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.28","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}