{
  "cveId": "CVE-2026-74543",
  "url": "https://patchblox.com/security/cve/CVE-2026-74543",
  "summary": "CVE-2026-74543 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2026-74543, released August 16, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "net: udp_tunnel: fix memory leak in udp_tunnel_nic_unregister()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net: udp_tunnel: fix memory leak in udp_tunnel_nic_unregister()  syzbot reported a memory leak [1] in the UDP tunnel NIC offload code.  When device registration fails (e.g. in register_netdevice()), netdev core unwinds by sending a single NETDEV_UNREGISTER notification. If work was queued during NETDEV_REGISTER (utn-\u003Ework_pending is set), udp_tunnel_nic_unregister() returns early:  \tif (utn-\u003Ework_pending) \t\treturn;  Because failed registrations do not enter netdev_wait_allrefs_any(), no subsequent NETDEV_UNREGISTER rebroadcast will ever occur. As a result, the struct udp_tunnel_nic allocated in udp_tunnel_nic_alloc() is leaked permanently.  Fix this by removing the early return. Instead, synchronously cancel any pending work with cancel_delayed_work_sync() before freeing @utn.  To be able to call cancel_delayed_work_sync() while holding RTNL (the work also needs RTNL), switch udp_tunnel_nic_device_sync_work() to rtnl_trylock(). If RTNL is contended, requeue the work with a 1 jiffy delay (via queue_delayed_work()) to prevent high CPU contention while waiting for RTNL lock.  The utn-\u003Ework_pending bookkeeping is no longer needed and is removed, as the workqueue core already tracks the pending/running state of the work.  [1] BUG: memory leak unreferenced object 0xffff888127d5f840 (size 96):   comm \u0022syz-executor\u0022, pid 5806, jiffies 4294942188   backtrace (crc 99fdb6c8):     __kmalloc_noprof\u002B0x3bf/0x550     udp_tunnel_nic_alloc net/ipv4/udp_tunnel_nic.c:756 [inline]     udp_tunnel_nic_register net/ipv4/udp_tunnel_nic.c:833 [inline]     udp_tunnel_nic_netdevice_event\u002B0x804/0xab0 net/ipv4/udp_tunnel_nic.c:931     notifier_call_chain\u002B0x59/0x160 kernel/notifier.c:85     call_netdevice_notifiers_info\u002B0x7d/0xb0 net/core/dev.c:2250     register_netdevice\u002B0xc10/0xeb0 net/core/dev.c:11478",
  "published": "2026-08-15T13:17:59Z",
  "severity": "Low",
  "cvss": 5.5,
  "epss": 0.00213,
  "epssPercentile": 0.11698,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74543",
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  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}