{"id":"CVE-2026-72405","summary":"net: udp_tunnel: prevent double queueing in udp_tunnel_nic_device_sync","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: udp_tunnel: prevent double queueing in udp_tunnel_nic_device_sync\n\nYue Sun reported a use-after-free and debugobjects warning in\nudp_tunnel_nic_device_sync_work() during concurrent device operations.\n\nThe workqueue core clears the internal pending bit before invoking the\nworker. At that point, a concurrent thread can queue the work again.\nWhen the already running worker eventually clears the work_pending flag\nto 0, it mistakenly clears the flag for the newly queued instance.\nudp_tunnel_nic_unregister() then observes work_pending as 0 and frees\nthe structure while the second work item is still active in the queue,\nleading to UAF.\n\nFix this by returning early in udp_tunnel_nic_device_sync() if\nwork_pending is already set, preventing redundant work queueing.","modified":"2026-08-18T03:56:25.420414981Z","published":"2026-08-15T05:56:29.466Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72405.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/54292b167466cdf42176b7b6f01da66c184deb12"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9075efb9b2c1d9d7a8285c937b64aa93ca0c41b7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cee6688e5731c0591643521716d1a1a5c1a98bf8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ecf69d4b43370c587e48d4d70289dbdb7e039d4d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72405.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72405"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"cc4e3835eff474aa274d6e1d18f69d9d296d3b76"},{"fixed":"cee6688e5731c0591643521716d1a1a5c1a98bf8"},{"fixed":"9075efb9b2c1d9d7a8285c937b64aa93ca0c41b7"},{"fixed":"54292b167466cdf42176b7b6f01da66c184deb12"},{"fixed":"ecf69d4b43370c587e48d4d70289dbdb7e039d4d"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72405.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.9.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72405.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}