CVE-2026-74543

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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"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": 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"providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T17:05:47.895Z"}}]}}

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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"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.191", "versionStartIncluding": "5.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.160", "versionStartIncluding": "5.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.103", "versionStartIncluding": "5.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.44", "versionStartIncluding": "5.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.8", "versionStartIncluding": "5.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "5.9"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:30:08.864Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74543", "state": "PUBLISHED", "dateUpdated": "2026-11-06T17:05:47.895Z", "dateReserved": "2026-08-15T05:44:03.914Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T12:27:53.336Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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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"}], "id": "CVE-2026-74543", "lastModified": "2026-11-06T17:19:50.353", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74543", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:59:05.638527Z", "version": "2.0.3"}}]}, "published": "2026-08-15T13:17:59.643", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/080695e6f005e2396f1207fd69d24c442cb230c6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/52c753b46265243406690d980faa9514d3f53827"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b322532a4b774db1b480a2de84125910a70739a5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b712da45bd9b9835d132e9fbc0c3e43c164cb1fd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d53a8b927ac9788257266e115d4901ec6f455387"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f82a2ded3d7a9098267c84f14eafdb98c4550ac5"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: net: udp_tunnel: fix memory leak in udp_tunnel_nic_unregister()", "id": "2516981", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516981"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-772", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: udp_tunnel: fix memory leak in udp_tunnel_nic_unregister()\nsyzbot reported a memory leak [1] in the UDP tunnel NIC offload code.\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:\nif (utn->work_pending)\nreturn;\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.\nFix this by removing the early return. Instead, synchronously cancel any\npending work with cancel_delayed_work_sync() before freeing @utn.\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.\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[1]\nBUG: memory leak\nunreferenced object 0xffff888127d5f840 (size 96):\ncomm \"syz-executor\", pid 5806, jiffies 4294942188\nbacktrace (crc 99fdb6c8):\n__kmalloc_noprof+0x3bf/0x550\nudp_tunnel_nic_alloc net/ipv4/udp_tunnel_nic.c:756 [inline]\nudp_tunnel_nic_register net/ipv4/udp_tunnel_nic.c:833 [inline]\nudp_tunnel_nic_netdevice_event+0x804/0xab0 net/ipv4/udp_tunnel_nic.c:931\nnotifier_call_chain+0x59/0x160 kernel/notifier.c:85\ncall_netdevice_notifiers_info+0x7d/0xb0 net/core/dev.c:2250\nregister_netdevice+0xc10/0xeb0 net/core/dev.c:11478", "A flaw was found in the Linux kernel's UDP tunnel network interface controller (NIC) offload code. When a device registration fails, the system may not properly unregister the NIC tunnel, leading to a permanent memory leak. This can result in resource exhaustion over time, potentially causing a Denial of Service (DoS) condition where the system becomes unresponsive or unstable."], "name": "CVE-2026-74543", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74543\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74543\nhttps://lore.kernel.org/linux-cve-announce/2026081549-CVE-2026-74543-8822@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cc4e3835eff474aa274d6e1d18f69d9d296d3b76,b712da45bd9b9835d132e9fbc0c3e43c164cb1fd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cc4e3835eff474aa274d6e1d18f69d9d296d3b76,f82a2ded3d7a9098267c84f14eafdb98c4550ac5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cc4e3835eff474aa274d6e1d18f69d9d296d3b76,b322532a4b774db1b480a2de84125910a70739a5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cc4e3835eff474aa274d6e1d18f69d9d296d3b76,080695e6f005e2396f1207fd69d24c442cb230c6)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.9"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.9)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.103,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.44,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.8,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc6,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T15:30:09.535406+00:00", "updated": "2026-08-21T23:30:17.179551+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-772"]}