{"id":"CVE-2026-63968","revision":null,"records":[{"revision":"fc21cfcd38ee4def83ed3d9f95fee506","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-63968","aliases":[],"title":"ipv6: fix possible infinite loop in fib6_select_path()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix possible infinite loop in fib6_select_path()\n\nFound while auditing the same pattern Sashiko reported in\nrt6_fill_node() [1]. Apply the same fix as\ncommit f8d8ce1b515a (\"ipv6: fix possible infinite loop in fib6_info_uses_dev()\").\n\nWriters holding tb6_lock can list_del_rcu(&first->fib6_siblings)\nwithout waiting for RCU readers; first->fib6_siblings.next then\nstill points into the old ring and this softirq-side walker never\nreaches &first->fib6_siblings as its terminator. fib6_purge_rt()\nalways WRITE_ONCE()s first->fib6_nsiblings to 0 before\nlist_del_rcu(), so an inside-loop check is a reliable detach signal.\n\n[1] https://sashiko.dev/#/patchset/20260526020227.4857-1-jiayuan.chen%40linux.dev","state":0,"publishedAt":"2026-07-19T14:55:55.62+00:00","modifiedAt":"2026-10-19T20:17:59.162+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/route.c\"\n ],\n \"versions\": [\n {\n \"version\": \"d0ec61c9f3583b76aebdbb271f5c0d3fcccd48b2\",\n \"lessThan\": \"3948a7d92f7678e89e1776bb2d169afcad63b1ae\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"52da02521ede55fb86546c3fffd9377b3261b91f\",\n \"lessThan\": \"c87cd3cb309634bc8f50a54e2079424f219ac21f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"34a949e7a0869dfa31a40416d2a56973fae1807b\",\n \"lessThan\": \"0f7b73c3452635de83b8711b31abdda8e49aad7b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d9ccb18f83ea2bb654289b6ecf014fd267cc988b\",\n \"lessThan\": \"ab9a10969a907b472a0196d999c08ff7144172e3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d9ccb18f83ea2bb654289b6ecf014fd267cc988b\",\n \"lessThan\": \"9b9d5bd6e3d4c9cecab5407604b690684b2532d2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d9ccb18f83ea2bb654289b6ecf014fd267cc988b\",\n \"lessThan\": \"9c7da87c2dc860bb17ca1ece942495d28b1ce3b9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"11edcd026012ac18acee0f1514db3ed1b160fc6f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6.1.128\",\n \"lessThan\": \"6.1.176\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.75\",\n \"lessThan\": \"6.6.143\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.2\",\n \"lessThan\": \"6.12.93\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.11.11\",\n \"lessThan\": \"6.12\",\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/ipv6/route.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.13\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.13\",\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\": \"6.12.93\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.35\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.12\",\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:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/3948a7d92f7678e89e1776bb2d169afcad63b1ae","https://git.kernel.org/stable/c/c87cd3cb309634bc8f50a54e2079424f219ac21f","https://git.kernel.org/stable/c/0f7b73c3452635de83b8711b31abdda8e49aad7b","https://git.kernel.org/stable/c/ab9a10969a907b472a0196d999c08ff7144172e3","https://git.kernel.org/stable/c/9b9d5bd6e3d4c9cecab5407604b690684b2532d2","https://git.kernel.org/stable/c/9c7da87c2dc860bb17ca1ece942495d28b1ce3b9"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63968","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-63968","identifiers":["CVE-2026-63968"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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