{"id":"CVE-2026-80733","summary":"net: remove WARN_ON_ONCE() from sk_mc_loop()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: remove WARN_ON_ONCE() from sk_mc_loop()\n\nsk_mc_loop() can be called for sockets that are neither AF_INET\nnor AF_INET6 (e.g. AF_PACKET sockets when sending packets via raw/packet\nsocket over virtual devices such as VRF or ipvlan).\n\nIn such cases, sk_family is not AF_INET/AF_INET6 and sk_mc_loop() falls\nthrough the switch statement and triggers WARN_ON_ONCE(1).\n\nNon-INET sockets do not support IP_MULTICAST_LOOP or IPV6_MULTICAST_LOOP\noptions, so loopback should default to true without generating a warning.","modified":"2026-10-28T02:30:37.677186312Z","published":"2026-09-03T08:21:50.136Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80733.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/97133c4d42654578fab95abe47359ebe784dde18"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ad7fa2f411cb30f63d6725f111be134064cdb718"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b8a39a09ae4eaae04309e1e38ed6a1101d967496"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c8f256dc849205ccb2bd78bd99a3497b972b44e0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d2adc4e80b29e58b5162ae09f0f657a215806c8c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f625c742b33dc137c209dd13d1c5f12b1c18d71c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80733.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80733"},{"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":"f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90"},{"fixed":"97133c4d42654578fab95abe47359ebe784dde18"},{"fixed":"f625c742b33dc137c209dd13d1c5f12b1c18d71c"},{"fixed":"ad7fa2f411cb30f63d6725f111be134064cdb718"},{"fixed":"d2adc4e80b29e58b5162ae09f0f657a215806c8c"},{"fixed":"ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe"},{"fixed":"c8f256dc849205ccb2bd78bd99a3497b972b44e0"},{"fixed":"0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f"},{"fixed":"b8a39a09ae4eaae04309e1e38ed6a1101d967496"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.14.40"},{"fixed":"3.15"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.18.13"},{"fixed":"3.19"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.19.6"},{"fixed":"3.20"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"c91f81773cd4bbebfe744e9ab30a7ce093f9b930"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"c8c30b2b17f2133e953850c547e3902c3a3d80e2"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3fe207e4637a2e792c46a08666aa722f77d7f8f7"}]}],"versions":["v3.14.79","v3.14.78","v3.14.77","v3.14.76","v3.14.75","v3.14.74","v3.14.73","v3.14.72","v3.14.71","v3.14.70","v3.14.69","v3.14.68","v3.14.67","v3.14.66","v3.14.65","v3.14.64","v3.14.63","v3.14.62","v3.14.61","v3.14.60","v3.14.59","v3.14.58","v3.14.57","v3.14.56","v3.14.55","v3.14.54","v3.14.53","v3.14.52","v3.14.51","v3.14.50","v3.14.49","v3.14.48","v3.14.47","v3.14.46","v3.14.45","v3.14.44","v3.14.43","v3.14.42","v3.14.41","v3.14.40","v3.18.140","v3.18.139","v3.18.138","v3.18.137","v3.18.136","v3.18.135","v3.18.134","v3.18.133","v3.18.132","v3.18.131","v3.18.130","v3.18.129","v3.18.128","v3.18.127","v3.18.126","v3.18.125","v3.18.124","v3.18.123","v3.18.122","v3.18.121","v3.18.120","v3.18.119","v3.18.118","v3.18.117","v3.18.116","v3.18.115","v3.18.114","v3.18.113","v3.18.112","v3.18.111","v3.18.110","v3.18.109","v3.18.108","v3.18.107","v3.18.106","v3.18.105","v3.18.104","v3.18.103","v3.18.102","v3.18.101","v3.18.100","v3.18.99","v3.18.98","v3.18.97","v3.18.96","v3.18.95","v3.18.94","v3.18.93","v3.18.92","v3.18.91","v3.18.90","v3.18.89","v3.18.88","v3.18.87","v3.18.86","v3.18.85","v3.18.84","v3.18.83","v3.18.82","v3.18.81","v3.18.80","v3.18.79","v3.18.78","v3.18.77","v3.18.76","v3.18.75","v3.18.74","v3.18.73","v3.18.72","v3.18.71","v3.18.70","v3.18.69","v3.18.68","v3.18.67","v3.18.66","v3.18.65","v3.18.64","v3.18.63","v3.18.62","v3.18.61","v3.18.60","v3.18.59","v3.18.58","v3.18.57","v3.18.56","v3.18.55","v3.18.54","v3.18.53","v3.18.52","v3.18.51","v3.18.50","v3.18.49","v3.18.48","v3.18.47","v3.18.46","v3.18.45","v3.18.44","v3.18.43","v3.18.42","v3.18.41","v3.18.40","v3.18.39","v3.18.38","v3.18.37","v3.18.36","v3.18.35","v3.18.34","v3.18.33","v3.18.32","v3.18.31","v3.18.30","v3.18.29","v3.18.28","v3.18.27","v3.18.26","v3.18.25","v3.18.24","v3.18.23","v3.18.22","v3.18.21","v3.18.20","v3.18.19","v3.18.18","v3.18.17","v3.18.16","v3.18.15","v3.18.14","v3.18.13","v3.19.8","v3.19.7","v3.19.6"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80733.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"5.10.265"}]},{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