{"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":"2026-09-05T03:48:20.161133466Z","published":"2026-09-03T08:21:50.136Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80733.json"},"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":"0"},{"last_affected":"c91f81773cd4bbebfe744e9ab30a7ce093f9b930"},{"last_affected":"c8c30b2b17f2133e953850c547e3902c3a3d80e2"},{"last_affected":"3fe207e4637a2e792c46a08666aa722f77d7f8f7"}]},{"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"}]}],"versions":["v3.14.39","v3.19.5","v3.18.12","v3.14.38","v3.19.4","v3.19.3","v3.14.37","v3.18.11","v3.14.36","v3.19.2","v3.19","v3.18.10","v3.19.1","v3.14.35","v3.18.9","v3.18.8","v3.14.34","v3.14.33","v3.18.7","v3.19-rc7","v3.19-rc5","v3.19-rc1","v3.18.6","v3.14.32","v3.18.5","v3.14.31","v3.19-rc6","v3.19-rc4","v3.14.30","v3.18.4","v3.18.3","v3.14.29","v3.18-rc1","v3.19-rc3","v3.19-rc2","v3.18.2","v3.14.28","v3.18.1","v3.14.27","v3.18","v3.14.26","v3.18-rc7","v3.14.25","v3.18-rc6","v3.18-rc2","v3.18-rc3","v3.18-rc4","v3.18-rc5","v3.14.24","v3.17","v3.14.23","v3.14.22","v3.17-rc1","v3.14.21","v3.17-rc7","v3.14.20","v3.17-rc2","v3.14.19","v3.17-rc4","v3.16","v3.17-rc5","v3.17-rc6","v3.14.18","v3.17-rc3","v3.14.17","v3.16-rc7","v3.14.16","v3.14.15","v3.16-rc1","v3.16-rc3","v3.14.14","v3.16-rc5","v3.16-rc6","v3.14.13","v3.16-rc2","v3.16-rc4","v3.14.12","v3.13","v3.14.11","v3.15","v3.14.10","v3.14.9","v3.14.8","v3.14.7","v3.14.6","v3.15-rc5","v3.14.5","v3.15-rc8","v3.15-rc1","v3.15-rc6","v3.15-rc3","v3.14.4","v3.15-rc7","v3.15-rc2","v3.15-rc4","v3.14","v3.14.3","v3.14.2","v3.14-rc4","v3.14.1","v3.14-rc8","v3.14-rc7","v3.14-rc6","v3.14-rc1","v3.14-rc2","v3.14-rc5","v3.14-rc3","v3.13-rc6","v3.13-rc8","v3.12","v3.13-rc7","v3.13-rc1","v3.13-rc4","v3.13-rc3","v3.13-rc5","v3.13-rc2","v3.12-rc7","v3.12-rc3","v3.12-rc6","v3.12-rc1","v3.12-rc5","v3.11","v3.12-rc2","v3.12-rc4","v3.11-rc7","v3.11-rc2","v3.11-rc5","v3.11-rc1","v3.11-rc3","v3.11-rc4","v3.11-rc6","v3.10-rc2","v3.10","v3.10-rc7","v3.10-rc6","v3.10-rc1","v3.10-rc5","v3.10-rc3","v3.10-rc4","v3.9","v3.9-rc2","v3.9-rc7","v3.9-rc8","v3.9-rc3","v3.9-rc6","v3.9-rc5","v3.9-rc4","v3.9-rc1","v3.8","v3.8-rc7","v3.8-rc6","v3.8-rc5","v3.8-rc2","v3.8-rc1","v3.8-rc3","v3.8-rc4","v3.7","v3.7-rc1","v3.6","v3.7-rc6","v3.7-rc7","v3.7-rc3","v3.7-rc8","v3.7-rc2","v3.7-rc4","v3.7-rc5","v3.6-rc7","v3.6-rc1","v3.5-rc3","v3.6-rc6","v3.6-rc5","v3.5","v3.6-rc3","v3.6-rc4","v3.6-rc2","v3.4-rc4","v3.5-rc7","v3.5-rc5","v3.5-rc6","v3.5-rc2","v3.5-rc1","v3.5-rc4","v3.4","v3.4-rc2","v3.4-rc1","v3.4-rc7","v3.4-rc6","v3.4-rc3","v3.4-rc5","v3.3","v3.3-rc6","v3.3-rc3","v3.3-rc7","v3.3-rc2","v3.3-rc5","v3.2","v3.3-rc4","v3.3-rc1","v3.2-rc4","v3.2-rc7","v3.2-rc6","v3.2-rc5","v3.2-rc3","v3.1","v3.2-rc2","v3.2-rc1","v3.1-rc1","v3.1-rc9","v3.1-rc8","v3.1-rc10","v3.1-rc7","v3.1-rc3","v3.1-rc2","v3.1-rc4","v3.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