{"id":"CVE-2026-43057","revision":"d70f4bf57f6a41ed91a6d004c515ed1f","records":[{"revision":"d70f4bf57f6a41ed91a6d004c515ed1f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-43057","aliases":[],"title":"net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: correctly handle tunneled traffic on IPV6_CSUM GSO fallback\n\nNETIF_F_IPV6_CSUM only advertises support for checksum offload of\npackets without IPv6 extension headers. Packets with extension\nheaders must fall back onto software checksumming. Since TSO\ndepends on checksum offload, those must revert to GSO.\n\nThe below commit introduces that fallback. It always checks\nnetwork header length. For tunneled packets, the inner header length\nmust be checked instead. Extend the check accordingly.\n\nA special case is tunneled packets without inner IP protocol. Such as\nRFC 6951 SCTP in UDP. Those are not standard IPv6 followed by\ntransport header either, so also must revert to the software GSO path.","state":0,"publishedAt":"2026-05-01T14:15:49.551+00:00","modifiedAt":"2026-10-15T01:18:55.064+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/core/dev.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"a0478d7e888028f85fa7785ea838ce0ca09398e2\",\n                            \"lessThan\": \"2094a7cf91b71367b649f991aacc7b579f793d0b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2156d9e9f2e483c8c3906c0ea57ea312c1424235\",\n                            \"lessThan\": \"ed71cf465c75f5688b07a35d373cd1d6b589c8ea\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"041e2f945f82fdbd6fff577b79c33469430297aa\",\n                            \"lessThan\": \"33670f780e0120c3dacda188c512bbffe0b6044c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"864e3396976ef41de6cc7bc366276bf4e084fff2\",\n                            \"lessThan\": \"a98b78116a27e2a57b696b569b2cb431c95cf9b6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"864e3396976ef41de6cc7bc366276bf4e084fff2\",\n                            \"lessThan\": \"732fdeb2987c94b439d51f5cb9addddc2fc48c42\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"864e3396976ef41de6cc7bc366276bf4e084fff2\",\n                            \"lessThan\": \"c4336a07eb6b2526dc2b62928b5104b41a7f81f5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"794ddbb7b63b6828c75967b9bcd43b086716e7a1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6.1.149\",\n                            \"lessThan\": \"6.1.168\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.103\",\n                            \"lessThan\": \"6.6.134\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.44\",\n                            \"lessThan\": \"6.12.81\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.16.4\",\n                            \"lessThan\": \"6.17\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\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/core/dev.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.17\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.17\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.168\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.134\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.81\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.22\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.12\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\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:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/2094a7cf91b71367b649f991aacc7b579f793d0b","https://git.kernel.org/stable/c/ed71cf465c75f5688b07a35d373cd1d6b589c8ea","https://git.kernel.org/stable/c/33670f780e0120c3dacda188c512bbffe0b6044c","https://git.kernel.org/stable/c/a98b78116a27e2a57b696b569b2cb431c95cf9b6","https://git.kernel.org/stable/c/732fdeb2987c94b439d51f5cb9addddc2fc48c42","https://git.kernel.org/stable/c/c4336a07eb6b2526dc2b62928b5104b41a7f81f5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43057","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-43057","identifiers":["CVE-2026-43057"]},"retained":false,"historicalAffected":[]}],"coverage":[]}