{"id":"CVE-2026-31668","revision":"2de7d4380f3d4d17b1847db4d7154d55","records":[{"revision":"2de7d4380f3d4d17b1847db4d7154d55","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-31668","aliases":[],"title":"seg6: separate dst_cache for input and output paths in seg6 lwtunnel","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nseg6: separate dst_cache for input and output paths in seg6 lwtunnel\n\nThe seg6 lwtunnel uses a single dst_cache per encap route, shared\nbetween seg6_input_core() and seg6_output_core(). These two paths\ncan perform the post-encap SID lookup in different routing contexts\n(e.g., ip rules matching on the ingress interface, or VRF table\nseparation). Whichever path runs first populates the cache, and the\nother reuses it blindly, bypassing its own lookup.\n\nFix this by splitting the cache into cache_input and cache_output,\nso each path maintains its own cached dst independently.","state":0,"publishedAt":"2026-04-24T14:45:16.63+00:00","modifiedAt":"2026-10-19T18:56:03.191+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/seg6_iptunnel.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6c8702c60b88651072460f3f4026c7dfe2521d12\",\n                            \"lessThan\": \"1dec91d3b1cefb82635761b7812154af3ef46449\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6c8702c60b88651072460f3f4026c7dfe2521d12\",\n                            \"lessThan\": \"750569d6987a0ff46317a4b86eb3907e296287bf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6c8702c60b88651072460f3f4026c7dfe2521d12\",\n                            \"lessThan\": \"57d0374d14fa667dec6952173b93e7e84486d5c9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6c8702c60b88651072460f3f4026c7dfe2521d12\",\n                            \"lessThan\": \"84d458018b147176b259347103fccb7e93abd2b1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6c8702c60b88651072460f3f4026c7dfe2521d12\",\n                            \"lessThan\": \"6305ad032b03d2ea4181b953a66e19a9a6ed053c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6c8702c60b88651072460f3f4026c7dfe2521d12\",\n                            \"lessThan\": \"fb56de5d99218de49d5d43ef3a99e062ecd0f9a1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6c8702c60b88651072460f3f4026c7dfe2521d12\",\n                            \"lessThan\": \"17d87d42874f5d6c1a0ccc6d9190dfe82a9a7a6a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6c8702c60b88651072460f3f4026c7dfe2521d12\",\n                            \"lessThan\": \"c3812651b522fe8437ebb7063b75ddb95b571643\",\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/seg6_iptunnel.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.10\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.10\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.253\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.203\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.169\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.135\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.82\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.23\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.13\",\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:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/1dec91d3b1cefb82635761b7812154af3ef46449","https://git.kernel.org/stable/c/750569d6987a0ff46317a4b86eb3907e296287bf","https://git.kernel.org/stable/c/57d0374d14fa667dec6952173b93e7e84486d5c9","https://git.kernel.org/stable/c/84d458018b147176b259347103fccb7e93abd2b1","https://git.kernel.org/stable/c/6305ad032b03d2ea4181b953a66e19a9a6ed053c","https://git.kernel.org/stable/c/fb56de5d99218de49d5d43ef3a99e062ecd0f9a1","https://git.kernel.org/stable/c/17d87d42874f5d6c1a0ccc6d9190dfe82a9a7a6a","https://git.kernel.org/stable/c/c3812651b522fe8437ebb7063b75ddb95b571643"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31668","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-31668","identifiers":["CVE-2026-31668"]},"retained":false,"historicalAffected":[]}],"coverage":[]}