{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23276",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-23276"
  ],
  "published": "2026-03-20T08:13:43Z",
  "summary": "net: add xmit recursion limit to tunnel xmit functions",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: add xmit recursion limit to tunnel xmit functions\n\nTunnel xmit functions (iptunnel_xmit, ip6tunnel_xmit) lack their own\nrecursion limit. When a bond device in broadcast mode has GRE tap\ninterfaces as slaves, and those GRE tunnels route back through the\nbond, multicast/broadcast traffic triggers infinite recursion between\nbond_xmit_broadcast() and ip_tunnel_xmit()/ip6_tnl_xmit(), causing\nkernel stack overflow.\n\nThe existing XMIT_RECURSION_LIMIT (8) in the no-qdisc path is not\nsufficient because tunnel recursion involves route lookups and full IP\noutput, consuming much more stack per level. Use a lower limit of 4\n(IP_TUNNEL_RECURSION_LIMIT) to prevent overflow.\n\nAdd recursion detection using dev_xmit_recursion helpers directly in\niptunnel_xmit() and ip6tunnel_xmit() to cover all IPv4/IPv6 tunnel\npaths including UDP encapsulated tunnels (VXLAN, Geneve, etc.).\n\nMove dev_xmit_recursion helpers from net/core/dev.h to public header\ninclude/linux/netdevice.h so they can be used by tunnel code.\n\n BUG: KASAN: stack-out-of-bounds in blake2s.constprop.0+0xe7/0x160\n Write of size 32 at addr ffff88810033fed0 by task kworker/0:1/11\n Workqueue: mld mld_ifc_work\n Call Trace:\n  <TASK>\n  __build_flow_key.constprop.0 (net/ipv4/route.c:515)\n  ip_rt_update_pmtu (net/ipv4/route.c:1073)\n  iptunnel_xmit (net/ipv4/ip_tunnel_core.c:84)\n  ip_tunnel_xmit (net/ipv4/ip_tunnel.c:847)\n  gre_tap_xmit (net/ipv4/ip_gre.c:779)\n  dev_hard_start_xmit (net/core/dev.c:3887)\n  sch_direct_xmit (net/sched/sch_generic.c:347)\n  __dev_queue_xmit (net/core/dev.c:4802)\n  bond_dev_queue_xmit (drivers/net/bonding/bond_main.c:312)\n  bond_xmit_broadcast (drivers/net/bonding/bond_main.c:5279)\n  bond_start_xmit (drivers/net/bonding/bond_main.c:5530)\n  dev_hard_start_xmit (net/core/dev.c:3887)\n  __dev_queue_xmit (net/core/dev.c:4841)\n  ip_finish_output2 (net/ipv4/ip_output.c:237)\n  ip_output (net/ipv4/ip_output.c:438)\n  iptunnel_xmit (net/ipv4/ip_tunnel_core.c:86)\n  gre_tap_xmit (net/ipv4/ip_gre.c:779)\n  dev_hard_start_xmit (net/core/dev.c:3887)\n  sch_direct_xmit (net/sched/sch_generic.c:347)\n  __dev_queue_xmit (net/core/dev.c:4802)\n  bond_dev_queue_xmit (drivers/net/bonding/bond_main.c:312)\n  bond_xmit_broadcast (drivers/net/bonding/bond_main.c:5279)\n  bond_start_xmit (drivers/net/bonding/bond_main.c:5530)\n  dev_hard_start_xmit (net/core/dev.c:3887)\n  __dev_queue_xmit (net/core/dev.c:4841)\n  ip_finish_output2 (net/ipv4/ip_output.c:237)\n  ip_output (net/ipv4/ip_output.c:438)\n  iptunnel_xmit (net/ipv4/ip_tunnel_core.c:86)\n  ip_tunnel_xmit (net/ipv4/ip_tunnel.c:847)\n  gre_tap_xmit (net/ipv4/ip_gre.c:779)\n  dev_hard_start_xmit (net/core/dev.c:3887)\n  sch_direct_xmit (net/sched/sch_generic.c:347)\n  __dev_queue_xmit (net/core/dev.c:4802)\n  bond_dev_queue_xmit (drivers/net/bonding/bond_main.c:312)\n  bond_xmit_broadcast (drivers/net/bonding/bond_main.c:5279)\n  bond_start_xmit (drivers/net/bonding/bond_main.c:5530)\n  dev_hard_start_xmit (net/core/dev.c:3887)\n  __dev_queue_xmit (net/core/dev.c:4841)\n  mld_sendpack\n  mld_ifc_work\n  process_one_work\n  worker_thread\n  </TASK>",
  "affected": [
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