{"id":"CVE-2026-98230","title":"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 b…","summary":"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 b…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= aa48a18fdb0911572d133057cd579db704b87da4 < fb38fb7420d5f7192f9e2b6ac835ede149cd7ac5","Linux >= 0045e3d80613cc7174dc15f189ee6fc4e73b9365 < 4748c27e2e6a1969e02f1df46e62f79d2799b80b","Linux >= 0045e3d80613cc7174dc15f189ee6fc4e73b9365 < 9b74a47a4cbd0d29faff4f3b199212c73e6b6220","Linux >= 0045e3d80613cc7174dc15f189ee6fc4e73b9365 < 2afb8dc1f4390f164db8352f8e685e126e9db566","Linux 5e4334dc39443645415450163ff5ff1ee7e79784","Linux >= 6.12.13 < 6.12.112","Linux 6.13"],"published":"2026-10-06","updated":"2026-10-07","sourceUpdated":"2026-10-07T07:17:05.663","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98230","references":[{"url":"https://git.kernel.org/stable/c/2afb8dc1f4390f164db8352f8e685e126e9db566","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4748c27e2e6a1969e02f1df46e62f79d2799b80b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9b74a47a4cbd0d29faff4f3b199212c73e6b6220","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fb38fb7420d5f7192f9e2b6ac835ede149cd7ac5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98230.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98230"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2546399"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98230"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98230"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98230.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00118,"epssPercentile":0.01706,"ingestedAt":"2026-10-06T08:50:17.437Z","cwe":["CWE-825"],"slug":"CVE-2026-98230","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-10-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98230.json)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":217280,"id":"CVE-2026-98230","ts":1791361305807,"field":"cvss","old":null,"new":"7"},{"seq":217279,"id":"CVE-2026-98230","ts":1791361305807,"field":"severity","old":"none","new":"high"}]}