{"id":"CVE-2026-45859","summary":"netfilter: nfnetlink_queue: do shared-unconfirmed check before segmentation","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_queue: do shared-unconfirmed check before segmentation\n\nUlrich reports a regression with nfqueue:\n\nIf an application did not set the 'F_GSO' capability flag and a gso\npacket with an unconfirmed nf_conn entry is received all packets are\nnow dropped instead of queued, because the check happens after\nskb_gso_segment().  In that case, we did have exclusive ownership\nof the skb and its associated conntrack entry.  The elevated use\ncount is due to skb_clone happening via skb_gso_segment().\n\nMove the check so that its peformed vs. the aggregated packet.\n\nThen, annotate the individual segments except the first one so we\ncan do a 2nd check at reinject time.\n\nFor the normal case, where userspace does in-order reinjects, this avoids\npacket drops: first reinjected segment continues traversal and confirms\nentry, remaining segments observe the confirmed entry.\n\nWhile at it, simplify nf_ct_drop_unconfirmed(): We only care about\nunconfirmed entries with a refcnt \u003e 1, there is no need to special-case\ndying entries.\n\nThis only happens with UDP.  With TCP, the only unconfirmed packet will\nbe the TCP SYN, those aren't aggregated by GRO.\n\nNext patch adds a udpgro test case to cover this scenario.","modified":"2026-07-08T08:02:18.036610338Z","published":"2026-05-27T12:15:39.322Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45859.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/207b3ebacb6113acaaec0d171d5307032c690004"},{"type":"WEB","url":"https://git.kernel.org/stable/c/23901aa6b8a2f294c4b774436b4691f3ff863a8f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/79b713ef4261a8ead96af4703f89d0b5f25532e2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b740e7ddd7ca0dbfeafca3f5e52717206cf28524"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45859.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45859"},{"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":"7d8dc1c7be8d3509e8f5164dd5df64c8e34d7eeb"},{"fixed":"79b713ef4261a8ead96af4703f89d0b5f25532e2"},{"fixed":"23901aa6b8a2f294c4b774436b4691f3ff863a8f"},{"fixed":"b740e7ddd7ca0dbfeafca3f5e52717206cf28524"},{"fixed":"207b3ebacb6113acaaec0d171d5307032c690004"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"6c4a0ba674f410ab99a30a16f32dac0ebfed5cd3"},{"last_affected":"6dcc8ba8a6074bb79040f502dc66ad23a58a1c86"},{"last_affected":"74e6eb7fd27ef1ccc68041dbc66e6d80d2e4a1a0"},{"last_affected":"025b3326c5c409b372d0103ad30f174e55adbd1b"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.15.166"},{"fixed":"5.16"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.1.107"},{"fixed":"6.2"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.48"},{"fixed":"6.7"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.10.7"},{"fixed":"6.11"}]}],"versions":["v6.10-rc1","v5.15.165","v6.10.6","v6.6.47","v6.1.106","v6.10","v6.10.5","v6.6.46","v6.1.105","v5.15.164","v6.10.4","v6.6.45","v6.1.104","v6.10.3","v6.6.44","v6.1.103","v6.10.2","v6.6.43","v6.1.102","v6.10.1","v6.6.42","v6.1.101","v5.15.163","v6.6.41","v6.1.100","v6.10-rc6","v6.6.40","v6.1.99","v5.15.162","v6.10-rc7","v6.6.39","v6.1.98","v6.10-rc3","v6.9-rc1","v6.6.38","v6.1.97","v6.10-rc5","v6.10-rc2","v6.6.37","v6.6.36","v6.1.96","v5.15.161","v6.10-rc4","v6.6.35","v6.1.95","v6.9","v6.6.34","v6.1.94","v6.6.33","v6.1.93","v5.15.160","v6.6.32","v6.1.92","v6.6.31","v6.1.91","v5.15.159","v6.6.30","v6.1.90","v5.15.158","v6.9-rc6","v6.9-rc7","v6.9-rc5","v6.9-rc3","v6.9-rc2","v6.8","v6.9-rc4","v6.6.29","v6.1.89","v5.15.157","v6.1.88","v6.6.28","v6.1.87","v5.15.156","v6.8-rc1","v6.6.27","v6.1.86","v5.15.155","v6.6.26","v6.1.85","v5.15.154","v6.6.25","v6.1.84","v5.15.153","v6.6.24","v6.6.23","v6.1.83","v5.15.152","v6.1.82","v6.6.22","v6.7-rc1","v6.8-rc7","v6.1.81","v6.6.21","v5.15.151","v6.8-rc6","v6.8-rc5","v6.8-rc4","v6.8-rc3","v6.8-rc2","v6.6.20","v6.1.80","v5.15.150","v6.6.19","v6.6.18","v6.1.79","v5.15.149","v6.6.17","v6.1.78","v5.15.148","v6.6.16","v6.1.77","v6.6.15","v6.1.76","v6.6.14","v6.1.75","v6.6.13","v6.1.74","v5.15.147","v6.7","v6.6.12","v6.1.73","v6.7-rc3","v6.7-rc8","v6.6.11","v6.1.72","v5.15.146","v6.7-rc7","v6.6.10","v6.1.71","v6.6.9","v6.1.70","v5.15.145","v6.7-rc6","v6.6.8","v6.1.69","v5.15.144","v6.7-rc2","v6.6.7","v6.1.68","v5.15.143","v6.7-rc4","v6.7-rc5","v6.6.6","v6.1.67","v5.15.142","v6.1.66","v6.6.5","v6.6.4","v6.1.65","v5.15.141","v6.6","v6.6.3","v6.1.64","v5.15.140","v6.6.2","v6.1.63","v5.15.139","v6.6.1","v6.1.62","v5.15.138","v6.6-rc1","v5.15.137","v6.1.61","v6.1.60","v6.6-rc5","v6.6-rc3","v6.6-rc7","v6.6-rc6","v6.6-rc4","v6.1.59","v5.15.136","v6.1.58","v5.15.135","v6.6-rc2","v6.1.57","v6.1.56","v5.15.134","v6.1.55","v5.15.133","v6.5","v6.1.54","v5.15.132","v6.5-rc1","v6.1.53","v5.15.131","v6.1.52","v6.5-rc2","v5.15.130","v6.1.51","v6.5-rc7","v5.15.129","v6.1.50","v5.15.128","v6.1.49","v6.1.48","v5.15.127","v6.1.47","v6.5-rc4","v6.5-rc3","v6.1.46","v6.5-rc6","v6.1.45","v5.15.126","v6.5-rc5","v5.15.125","v6.1.44","v6.1.43","v5.15.124","v6.1.42","v5.15.123","v6.1.41","v5.15.122","v5.15.121","v6.1.40","v6.1.39","v5.15.120","v6.1.38","v6.4","v6.4-rc7","v6.4-rc1","v6.1.37","v5.15.119","v6.1.36","v6.4-rc6","v6.1.35","v5.15.118","v6.4-rc5","v6.4-rc3","v6.1.34","v5.15.117","v6.4-rc4","v6.4-rc2","v6.1.33","v5.15.116","v6.1.32","v5.15.115","v6.1.31","v5.15.114","v6.1.30","v5.15.113","v5.15.112","v6.1.29","v6.1.28","v5.15.111","v6.3","v6.1.27","v5.15.110","v6.1.26","v5.15.109","v6.3-rc1","v6.1.25","v5.15.108","v6.3-rc7","v6.3-rc2","v6.3-rc3","v6.3-rc5","v6.3-rc6","v6.3-rc4","v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