{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98369",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-98369"
  ],
  "published": "2026-10-06T08:47:10Z",
  "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().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-98369"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/41e47f1664be86c91326f0afe0504a1162d00907"
    },
    {
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      "url": "https://git.kernel.org/stable/c/6601d91a85761f33351c71e04ec0bbd294ca07ce"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0cda8273265d30cac6423834fd7d4acb75f04fdb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/68a317b4aec8ca1868a39d69e40f9e29baa4f40a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6eb3b071be8e260543c604550c54dac66e6b174b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/664fc0941df7c1918b2cd4de6ee00469ba77d8e4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d2f5082f9e84653fa1a9e8aebaaff23e688f5e19"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-07T06:50:27Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The use-after-free happens only when a queued packet's net_device or noref dst is freed before xfrm_trans_reinject() runs. A remote ESP peer sends the packet but cannot unregister the device or change routes, so the attacker who controls the whole race is local: they create the netns, veth and XFRM SA through xfrm_user netlink.\nAC:L - The attacker does both sides of the race. They send ESP transport-mode packets that xfrm4_transport_finish/xfrm6_transport_finish queue through xfrm_trans_queue(), then delete the veth or route while the workqueue is still behind. Flooding the queue up to max_backlog widens the window.\nPR:L - xfrm_user_rcv_msg checks netlink_net_capable(CAP_NET_ADMIN), which an unprivileged user gets in a new user and network namespace (unshare -Urn). That lets them create the SA, the veth devices and the routes the trigger needs.\nUI:N - No victim action is needed. The attacker sets up the namespace, sends the packets and tears down the device or route themselves.\nS:U - The freed net_device, dst_entry and RCU-protected route data are kernel memory, and the impact stays within the kernel's own security authority.\nC:H - ip6_rcv_finish and dst_input in xfrm_trans_reinject() read a freed skb->dev or noref dst_entry with no reference and no RCU lock. If an attacker reclaims that memory, these use-after-free reads can leak kernel memory.\nI:H - The freed dst_entry holds an input function pointer that dst_input() calls, and net_device is full of ops pointers. Reclaiming either object with attacker-controlled data gives a path to hijacking control flow.\nA:H - A use-after-free of the net_device or dst in the xfrm_trans_reinject worker crashes the kernel, and syzbot hit the missing-RCU path in ip6_pkt_drop. The attacker can trigger it repeatedly."
    }
  }
}