{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-56751",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-56751"
  ],
  "published": "2024-12-29T11:31:32Z",
  "summary": "ipv6: release nexthop on device removal",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: release nexthop on device removal\n\nThe CI is hitting some aperiodic hangup at device removal time in the\npmtu.sh self-test:\n\nunregister_netdevice: waiting for veth_A-R1 to become free. Usage count = 6\nref_tracker: veth_A-R1@ffff888013df15d8 has 1/5 users at\n\tdst_init+0x84/0x4a0\n\tdst_alloc+0x97/0x150\n\tip6_dst_alloc+0x23/0x90\n\tip6_rt_pcpu_alloc+0x1e6/0x520\n\tip6_pol_route+0x56f/0x840\n\tfib6_rule_lookup+0x334/0x630\n\tip6_route_output_flags+0x259/0x480\n\tip6_dst_lookup_tail.constprop.0+0x5c2/0x940\n\tip6_dst_lookup_flow+0x88/0x190\n\tudp_tunnel6_dst_lookup+0x2a7/0x4c0\n\tvxlan_xmit_one+0xbde/0x4a50 [vxlan]\n\tvxlan_xmit+0x9ad/0xf20 [vxlan]\n\tdev_hard_start_xmit+0x10e/0x360\n\t__dev_queue_xmit+0xf95/0x18c0\n\tarp_solicit+0x4a2/0xe00\n\tneigh_probe+0xaa/0xf0\n\nWhile the first suspect is the dst_cache, explicitly tracking the dst\nowing the last device reference via probes proved such dst is held by\nthe nexthop in the originating fib6_info.\n\nSimilar to commit f5b51fe804ec (\"ipv6: route: purge exception on\nremoval\"), we need to explicitly release the originating fib info when\ndisconnecting a to-be-removed device from a live ipv6 dst: move the\nfib6_info cleanup into ip6_dst_ifdown().\n\nTested running:\n\n./pmtu.sh cleanup_ipv6_exception\n\nin a tight loop for more than 400 iterations with no spat, running an\nunpatched kernel  I observed a splat every ~10 iterations.",
  "affected": [
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        "ecosystem": "Raspberry Pi OS:12",
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-56751"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/77aa9855a878fb43f547ddfbda3127a1e88ad31a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b2f26a27ea3f72f75d18330f76f5d1007c791848"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/43e25adc80269f917d2a195f0d59f74cdd182955"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a3c3f8a4d025acc8c857246ec2b812c59102487a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0e4c6faaef8a24b762a24ffb767280e263ef8e10"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/eb02688c5c45c3e7af7e71f036a7144f5639cbfe"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}