{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"LOW" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: udp_tunnel: fix memory leak in udp_tunnel_nic_unregister()\n\nsyzbot reported a memory leak [1] in the UDP tunnel NIC offload code.\n\nWhen device registration fails (e.g. in register_netdevice()), netdev core\nunwinds by sending a single NETDEV_UNREGISTER notification. If work was queued\nduring NETDEV_REGISTER (utn->work_pending is set), udp_tunnel_nic_unregister()\nreturns early:\n\n\tif (utn->work_pending)\n\t\treturn;\n\nBecause failed registrations do not enter netdev_wait_allrefs_any(), no\nsubsequent NETDEV_UNREGISTER rebroadcast will ever occur. As a result, the\nstruct udp_tunnel_nic allocated in udp_tunnel_nic_alloc() is leaked\npermanently.\n\nFix this by removing the early return. Instead, synchronously cancel any\npending work with cancel_delayed_work_sync() before freeing @utn.\n\nTo be able to call cancel_delayed_work_sync() while holding RTNL (the work also\nneeds RTNL), switch udp_tunnel_nic_device_sync_work() to rtnl_trylock(). If RTNL\nis contended, requeue the work with a 1 jiffy delay (via queue_delayed_work())\nto prevent high CPU contention while waiting for RTNL lock.\n\nThe utn->work_pending bookkeeping is no longer needed and is removed, as\nthe workqueue core already tracks the pending/running state of the work.\n\n[1]\nBUG: memory leak\nunreferenced object 0xffff888127d5f840 (size 96):\n comm \"syz-executor\", pid 5806, jiffies 4294942188\n backtrace (crc 99fdb6c8):\n __kmalloc_noprof+0x3bf/0x550\n udp_tunnel_nic_alloc net/ipv4/udp_tunnel_nic.c:756 [inline]\n udp_tunnel_nic_register net/ipv4/udp_tunnel_nic.c:833 [inline]\n udp_tunnel_nic_netdevice_event+0x804/0xab0 net/ipv4/udp_tunnel_nic.c:931\n notifier_call_chain+0x59/0x160 kernel/notifier.c:85\n call_netdevice_notifiers_info+0x7d/0xb0 net/core/dev.c:2250\n register_netdevice+0xc10/0xeb0 net/core/dev.c:11478", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74543" }, { "summary":"CVE-2026-74543 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2026/csaf-openeuler-cve-2026-74543.json" }, { "summary":"openEuler-SA-2026-3707", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3707" }, { "summary":"CVE-2026-74543", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-74543&packageName=kernel" } ], "title":"openEuler cve CVE-2026-74543", "tracking":{ "initial_release_date":"2026-09-16T18:03:51+08:00", "revision_history":[ { "date":"2026-09-16T18:03:51+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-09-16T18:03:51+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-09-16T18:03:51+08:00", "id":"CVE-2026-74543", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { 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code.\n\nWhen device registration fails (e.g. in register_netdevice()), netdev core\nunwinds by sending a single NETDEV_UNREGISTER notification. If work was queued\nduring NETDEV_REGISTER (utn->work_pending is set), udp_tunnel_nic_unregister()\nreturns early:\n\n\tif (utn->work_pending)\n\t\treturn;\n\nBecause failed registrations do not enter netdev_wait_allrefs_any(), no\nsubsequent NETDEV_UNREGISTER rebroadcast will ever occur. As a result, the\nstruct udp_tunnel_nic allocated in udp_tunnel_nic_alloc() is leaked\npermanently.\n\nFix this by removing the early return. Instead, synchronously cancel any\npending work with cancel_delayed_work_sync() before freeing @utn.\n\nTo be able to call cancel_delayed_work_sync() while holding RTNL (the work also\nneeds RTNL), switch udp_tunnel_nic_device_sync_work() to rtnl_trylock(). If RTNL\nis contended, requeue the work with a 1 jiffy delay (via queue_delayed_work())\nto prevent high CPU contention while waiting for RTNL lock.\n\nThe utn->work_pending bookkeeping is no longer needed and is removed, as\nthe workqueue core already tracks the pending/running state of the work.\n\n[1]\nBUG: memory leak\nunreferenced object 0xffff888127d5f840 (size 96):\n comm \"syz-executor\", pid 5806, jiffies 4294942188\n backtrace (crc 99fdb6c8):\n __kmalloc_noprof+0x3bf/0x550\n udp_tunnel_nic_alloc net/ipv4/udp_tunnel_nic.c:756 [inline]\n udp_tunnel_nic_register net/ipv4/udp_tunnel_nic.c:833 [inline]\n udp_tunnel_nic_netdevice_event+0x804/0xab0 net/ipv4/udp_tunnel_nic.c:931\n notifier_call_chain+0x59/0x160 kernel/notifier.c:85\n call_netdevice_notifiers_info+0x7d/0xb0 net/core/dev.c:2250\n register_netdevice+0xc10/0xeb0 net/core/dev.c:11478", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ 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"openEuler-24.03-LTS-SP1:kernel-6.6.0-145.1.25.162.oe2403sp1.src" ] } ], "threats":[ { "details":"Medium", "category":"impact" } ], "title":"CVE-2026-74543" } ] }