{"id":"CVE-2026-98230","revision":"ccf022c312ce4da0a6d28ef6ebf1280c","records":[{"revision":"ccf022c312ce4da0a6d28ef6ebf1280c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98230","aliases":[],"title":"xfrm: use hlist_del_init_rcu for state_cache and state_cache_input","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: use hlist_del_init_rcu for state_cache and state_cache_input\n\nCommit 14acf9652e56 (\"xfrm: defensively unhash xfrm_state lists in\n__xfrm_state_delete\") converted bydst/bysrc/byseq/byspi from\nhlist_del_rcu() to hlist_del_init_rcu() so that a second\n__xfrm_state_delete() on the same object becomes a no-op rather than a\nwrite through LIST_POISON pprev. It missed state_cache and\nstate_cache_input, which kept hlist_del_rcu():\n\n- hlist_del_rcu() leaves pprev = LIST_POISON2 (non-NULL), so\n  hlist_unhashed() returns false.\n- hlist_del_init_rcu() leaves pprev = NULL, so hlist_unhashed()\n  returns true.\n\nA second __xfrm_state_delete() therefore enters __hlist_del() on the\nalready-deleted state_cache/state_cache_input nodes and does\nWRITE_ONCE(*pprev, next) through LIST_POISON2 — a write use-after-free\nonce the slab is reused. The corruption can in turn cause a subsequent\nhlist_for_each_entry_rcu traversal to follow a dangling next pointer,\nproducing the read use-after-free reported in xfrm_input_state_lookup().\n\nSwitch state_cache and state_cache_input to hlist_del_init_rcu() to\nmatch the other four lists, closing the write use-after-free and, with\nit, the read use-after-free it spawns.","state":0,"publishedAt":"2026-10-06T08:45:04.548+00:00","modifiedAt":"2026-10-19T09:16:02.121+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/xfrm/xfrm_state.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"aa48a18fdb0911572d133057cd579db704b87da4\",\n                            \"lessThan\": \"fb38fb7420d5f7192f9e2b6ac835ede149cd7ac5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0045e3d80613cc7174dc15f189ee6fc4e73b9365\",\n                            \"lessThan\": \"4748c27e2e6a1969e02f1df46e62f79d2799b80b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0045e3d80613cc7174dc15f189ee6fc4e73b9365\",\n                            \"lessThan\": \"9b74a47a4cbd0d29faff4f3b199212c73e6b6220\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0045e3d80613cc7174dc15f189ee6fc4e73b9365\",\n                            \"lessThan\": \"2afb8dc1f4390f164db8352f8e685e126e9db566\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e4334dc39443645415450163ff5ff1ee7e79784\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6.12.13\",\n                            \"lessThan\": \"6.12.112\",\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/xfrm/xfrm_state.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\": \"6.12.112\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.54\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.8\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/fb38fb7420d5f7192f9e2b6ac835ede149cd7ac5","https://git.kernel.org/stable/c/4748c27e2e6a1969e02f1df46e62f79d2799b80b","https://git.kernel.org/stable/c/9b74a47a4cbd0d29faff4f3b199212c73e6b6220","https://git.kernel.org/stable/c/2afb8dc1f4390f164db8352f8e685e126e9db566"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98230","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98230","identifiers":["CVE-2026-98230"]},"retained":false,"historicalAffected":[]}],"coverage":[]}