{"id":"CVE-2026-53228","revision":null,"records":[{"revision":"48b73dfca49b46699d74b2dcfbaa88bb","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-53228","aliases":[],"title":"ipv6: sit: reload inner IPv6 header after GSO offloads","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: sit: reload inner IPv6 header after GSO offloads\n\nipip6_tunnel_xmit() caches the inner IPv6 header pointer at function\nentry and continues using it after iptunnel_handle_offloads().\n\nFor GSO skbs, iptunnel_handle_offloads() calls skb_header_unclone().\nWhen the skb header is cloned, skb_header_unclone() can call\npskb_expand_head(), which may move the skb head. The pskb_expand_head()\ncontract requires pointers into the skb header to be reloaded after the\ncall.\n\nIf the later skb_realloc_headroom() branch is not taken, SIT uses the\nstale iph6 pointer to read the inner hop limit and DS field. That can\nread from a freed skb head after the old head's remaining clone is\nreleased.\n\nReload iph6 after the offload helper succeeds and before subsequent\nreads from the inner IPv6 header. Keep the existing reload after\nskb_realloc_headroom(), since that branch can also replace the skb.","state":0,"publishedAt":"2026-06-25T08:39:27.893+00:00","modifiedAt":"2026-10-19T19:57:30.192+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/ipv6/sit.c\"\n ],\n \"versions\": [\n {\n \"version\": \"14909664e4e192f4c6f6fcdccd9919af7cf783ab\",\n \"lessThan\": \"fddd41445a0537b093e6b3f6232c9933cad1e48b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"14909664e4e192f4c6f6fcdccd9919af7cf783ab\",\n \"lessThan\": \"1132e5edc2866c3530be17622153a597095f0e43\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"14909664e4e192f4c6f6fcdccd9919af7cf783ab\",\n \"lessThan\": \"9c67b44edb3598d234efae6e44649eb993c03da5\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"14909664e4e192f4c6f6fcdccd9919af7cf783ab\",\n \"lessThan\": \"0bfa7bba1f41aaf5f0604dc712bb4701493e3aa0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"14909664e4e192f4c6f6fcdccd9919af7cf783ab\",\n \"lessThan\": \"59f80c919713250fe5d25a4d9aea4e49580fa1d4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"14909664e4e192f4c6f6fcdccd9919af7cf783ab\",\n \"lessThan\": \"2fa49b2715e1bad12ce3b0fa64e234d9582c8193\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"14909664e4e192f4c6f6fcdccd9919af7cf783ab\",\n \"lessThan\": \"cb658c2f5f7977c2a1c77c9f239f4bc8196edb5c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"14909664e4e192f4c6f6fcdccd9919af7cf783ab\",\n \"lessThan\": \"f0e42f0c4337b1f220de1ddd63f47197c7dee4de\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/ipv6/sit.c\"\n ],\n \"versions\": [\n {\n \"version\": \"3.18\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"3.18\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.259\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.210\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.176\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.143\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.94\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.36\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.13\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/fddd41445a0537b093e6b3f6232c9933cad1e48b","https://git.kernel.org/stable/c/1132e5edc2866c3530be17622153a597095f0e43","https://git.kernel.org/stable/c/9c67b44edb3598d234efae6e44649eb993c03da5","https://git.kernel.org/stable/c/0bfa7bba1f41aaf5f0604dc712bb4701493e3aa0","https://git.kernel.org/stable/c/59f80c919713250fe5d25a4d9aea4e49580fa1d4","https://git.kernel.org/stable/c/2fa49b2715e1bad12ce3b0fa64e234d9582c8193","https://git.kernel.org/stable/c/cb658c2f5f7977c2a1c77c9f239f4bc8196edb5c","https://git.kernel.org/stable/c/f0e42f0c4337b1f220de1ddd63f47197c7dee4de"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53228","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-53228","identifiers":["CVE-2026-53228"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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