{"id":"CVE-2026-98369","revision":"ab0a81dc44714949b1ccdd5c6d14e46b","records":[{"revision":"ab0a81dc44714949b1ccdd5c6d14e46b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98369","aliases":[],"title":"xfrm: add missing rcu_read_lock(), skb_dst_force() and dev_hold() for xfrm_trans_reinject()","description":"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().","state":0,"publishedAt":"2026-10-06T08:46:54.188+00:00","modifiedAt":"2026-10-19T09:18:21.221+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_input.c\"\n ],\n \"versions\": [\n {\n \"version\": \"7d98b26684cb2390729525b341ea099f0badbe18\",\n \"lessThan\": \"41e47f1664be86c91326f0afe0504a1162d00907\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"4f4920669d21e1060b7243e5118dc3b71ced1276\",\n \"lessThan\": \"6601d91a85761f33351c71e04ec0bbd294ca07ce\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"4f4920669d21e1060b7243e5118dc3b71ced1276\",\n \"lessThan\": \"0cda8273265d30cac6423834fd7d4acb75f04fdb\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"4f4920669d21e1060b7243e5118dc3b71ced1276\",\n \"lessThan\": \"68a317b4aec8ca1868a39d69e40f9e29baa4f40a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"4f4920669d21e1060b7243e5118dc3b71ced1276\",\n \"lessThan\": \"6eb3b071be8e260543c604550c54dac66e6b174b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"4f4920669d21e1060b7243e5118dc3b71ced1276\",\n \"lessThan\": \"664fc0941df7c1918b2cd4de6ee00469ba77d8e4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"4f4920669d21e1060b7243e5118dc3b71ced1276\",\n \"lessThan\": \"d2f5082f9e84653fa1a9e8aebaaff23e688f5e19\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"f520075da484306bbb8425afd2c42404ba74816f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"130d9e5017ade1b81d16783563edb38c12a2eab7\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.15.75\",\n \"lessThan\": \"5.15.222\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.19.17\",\n \"lessThan\": \"5.20\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.0.3\",\n \"lessThan\": \"6.1\",\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_input.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.1\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.1\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.222\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.189\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.158\",\n \"lessThanOrEqual\": \"6.6.*\",\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:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/41e47f1664be86c91326f0afe0504a1162d00907","https://git.kernel.org/stable/c/6601d91a85761f33351c71e04ec0bbd294ca07ce","https://git.kernel.org/stable/c/0cda8273265d30cac6423834fd7d4acb75f04fdb","https://git.kernel.org/stable/c/68a317b4aec8ca1868a39d69e40f9e29baa4f40a","https://git.kernel.org/stable/c/6eb3b071be8e260543c604550c54dac66e6b174b","https://git.kernel.org/stable/c/664fc0941df7c1918b2cd4de6ee00469ba77d8e4","https://git.kernel.org/stable/c/d2f5082f9e84653fa1a9e8aebaaff23e688f5e19"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98369","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98369","identifiers":["CVE-2026-98369"]},"retained":false,"historicalAffected":[]}],"coverage":[]}