{"schema":"threatline.record/2","record":{"id":"CVE-2026-98369","aliases":[],"summary":"xfrm: add missing rcu_read_lock(), skb_dst_force() and dev_hold() for xfrm_trans_reinject()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: add missing rcu_read_lock(), skb_dst_force() and dev_hold() for xfrm_trans_reinject()\n\nsyzbot reported a suspicious RCU usage warning in ip6_pkt_drop():\n\n  WARNING: suspicious RCU usage in ip6_pkt_drop\n  include/net/addrconf.h:389 suspicious rcu_dereference_check() usage!\n\n  Call Trace:\n   __in6_dev_get_safely include/net/addrconf.h:389 [inline]\n   ip6_pkt_drop+0x596/0x610 net/ipv6/route.c:4620\n   ip6_pkt_discard+0x1c/0x30 net/ipv6/route.c:4651\n   xfrm_trans_reinject+0x324/0x630 net/xfrm/xfrm_input.c:806\n   process_one_work kernel/workqueue.c:3322 [inline]\n   process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405\n   worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486\n\nWhen commit 4f4920669d21 (\"xfrm: Reinject transport-mode packets through\nworkqueue\") converted xfrm_trans_reinject from a tasklet to a workqueue,\nthe reinjection loop ceased running in softirq context. Workqueue workers\nrun in process context where local_bh_disable() does not enter an RCU\nread-side critical section under CONFIG_PREEMPT_RCU.\n\nBecause finish callbacks (such as ip6_rcv_finish) expect to run under an\nRCU read lock (performing route lookups, l3mdev lookups, and accessing\nRCU-protected data structures), invoking them in workqueue context without\nrcu_read_lock() triggers RCU lockdep warnings.\n\nFurthermore, packets queued to the workqueue via xfrm_trans_queue_net()\nmay carry non-refcounted (noref) dst entries (e.g. from ip_route_input_noref).\nAdditionally, on netdevice unregistration, dst_dev_put() replaces dst->dev\nwith blackhole_netdev, so dst entries do not keep skb->dev alive while\nqueued in the workqueue.\n\nFix these issues by:\n1. Calling skb_dst_force(skb) in xfrm_trans_queue_net() while still in the\n   caller's RCU section to ensure dst is reference-counted before queuing.\n2. Holding a reference on skb->dev via dev_hold()/dev_put() across workqueue\n   deferral so skb->dev remains valid during finish() callback processing.\n3. Acquiring rcu_read_lock() around the finish callback invocation loop in\n   xfrm_trans_reinject().","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98369","source_modified_at":"2026-10-19T09:18:21.221Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"7d98b26684cb2390729525b341ea099f0badbe18","lessThan":"41e47f1664be86c91326f0afe0504a1162d00907","status":"affected","versionType":"git"},{"version":"4f4920669d21e1060b7243e5118dc3b71ced1276","lessThan":"6601d91a85761f33351c71e04ec0bbd294ca07ce","status":"affected","versionType":"git"},{"version":"4f4920669d21e1060b7243e5118dc3b71ced1276","lessThan":"0cda8273265d30cac6423834fd7d4acb75f04fdb","status":"affected","versionType":"git"},{"version":"4f4920669d21e1060b7243e5118dc3b71ced1276","lessThan":"68a317b4aec8ca1868a39d69e40f9e29baa4f40a","status":"affected","versionType":"git"},{"version":"4f4920669d21e1060b7243e5118dc3b71ced1276","lessThan":"6eb3b071be8e260543c604550c54dac66e6b174b","status":"affected","versionType":"git"},{"version":"4f4920669d21e1060b7243e5118dc3b71ced1276","lessThan":"664fc0941df7c1918b2cd4de6ee00469ba77d8e4","status":"affected","versionType":"git"},{"version":"4f4920669d21e1060b7243e5118dc3b71ced1276","lessThan":"d2f5082f9e84653fa1a9e8aebaaff23e688f5e19","status":"affected","versionType":"git"},{"version":"f520075da484306bbb8425afd2c42404ba74816f","status":"affected","versionType":"git"},{"version":"130d9e5017ade1b81d16783563edb38c12a2eab7","status":"affected","versionType":"git"},{"version":"5.15.75","lessThan":"5.15.222","status":"affected","versionType":"semver"},{"version":"5.19.17","lessThan":"5.20","status":"affected","versionType":"semver"},{"version":"6.0.3","lessThan":"6.1","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98369","source_modified_at":"2026-10-19T09:18:21.221Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.1","status":"affected"},{"version":"0","lessThan":"6.1","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.54","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.8","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98369","source_modified_at":"2026-10-19T09:18:21.221Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"41e47f1664be86c91326f0afe0504a1162d00907","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98369","source_modified_at":"2026-10-19T09:18:21.221Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6601d91a85761f33351c71e04ec0bbd294ca07ce","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98369","source_modified_at":"2026-10-19T09:18:21.221Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"0cda8273265d30cac6423834fd7d4acb75f04fdb","basis":"first unaffected version stated in the CVE record"},{"source":"CVE 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record"}],"cvss":7.8,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00146,"percentile":0.03479,"score_date":"2026-10-23"},"published_at":"2026-10-06T08:46:54.188Z","modified_at":"2026-10-19T09:18:21.221Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98369","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:18:21.221Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98369","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/41e47f1664be86c91326f0afe0504a1162d00907"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/6601d91a85761f33351c71e04ec0bbd294ca07ce"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/0cda8273265d30cac6423834fd7d4acb75f04fdb"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/68a317b4aec8ca1868a39d69e40f9e29baa4f40a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/6eb3b071be8e260543c604550c54dac66e6b174b"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/664fc0941df7c1918b2cd4de6ee00469ba77d8e4"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/d2f5082f9e84653fa1a9e8aebaaff23e688f5e19"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:18:21.221Z","content_hash":"a12381230f4d5f8fd9086ecb4c050b600e57b7c4d3a9ee60f0ec0a212e3475da"}}