{"id":"CVE-2026-90063","summary":"virtio-net: Ensure that TCP packets don't overflow gso_segs","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: Ensure that TCP packets don't overflow gso_segs\n\nThe user can specify any gso_size in a packet crafted with an AF_PACKET\nPACKET_VNET_HDR socket, even smaller than TCP_MIN_GSO_SIZE = 8. At the\nsame time, GSO_MAX_SIZE = 8 * GSO_MAX_SEGS = 8 * 65535. When the user\ncrafts a packet with gso_size \u003c 8, there is a risk for partial GSO to\noverflow the 16-bit gso_segs field when dividing the SKB length by\ngso_size.\n\nAdjust gso_size of TCP packets to be at least TCP_MIN_GSO_SIZE = 8. Keep\ngso_size of UDP GSO packets, as gso_size=1 is valid and explicitly\ntested at tools/testing/selftests/net/tun.c:649.","modified":"2026-09-18T03:48:35.485141813Z","published":"2026-09-17T16:05:46.968Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90063.json","cna_assigner":"Linux"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0e5ed3b98d1d8d251acfdccfeaa607453ad12954"},{"type":"WEB","url":"https://git.kernel.org/stable/c/29bd12c7c5f9d6cf855b87bace18f71e9607f9e8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/339f47ae04dcc6b5a730dd6bc70dddc8937c3260"},{"type":"WEB","url":"https://git.kernel.org/stable/c/75c271c48f483af678e514734e10b2452410e08c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8f6667a081887c2b59c6f3dd86c1789ada563762"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c27c449d455aafd9018a3cbab150f1c42c87923f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d3d111fe809773edbb4ae121e36253b7d683509a"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90063.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90063"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"7c6d2ecbda83150b2036a2b36b21381ad4667762"},{"fixed":"d3d111fe809773edbb4ae121e36253b7d683509a"},{"fixed":"8f6667a081887c2b59c6f3dd86c1789ada563762"},{"fixed":"339f47ae04dcc6b5a730dd6bc70dddc8937c3260"},{"fixed":"29bd12c7c5f9d6cf855b87bace18f71e9607f9e8"},{"fixed":"0e5ed3b98d1d8d251acfdccfeaa607453ad12954"},{"fixed":"75c271c48f483af678e514734e10b2452410e08c"},{"fixed":"c27c449d455aafd9018a3cbab150f1c42c87923f"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"bfbaf151efe491e30697e21c8b7ae1b615480873"},{"last_affected":"6c83456601e65a6dd371ddf595510183d198e9b1"},{"last_affected":"b3ebd9830c6026c98f03f7047c9d608573773f13"},{"last_affected":"b96fb681ca789629b8ba3da99ca3b2e6fa807f0a"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.14.187"},{"fixed":"4.15"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.19.131"},{"fixed":"4.20"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.4.46"},{"fixed":"5.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.6.18"},{"fixed":"5.7"}]}],"versions":["v4.19.130","v4.14.186","v4.14.185","v4.19.129","v4.19.128","v4.14.184","v4.14.183","v4.19.127","v5.4.45","v5.6.17","v5.4.44","v4.19.126","v5.6.16","v5.6.15","v5.4.43","v4.19.125","v4.14.182","v5.6.14","v5.4.42","v4.19.124","v4.14.181","v5.6.13","v5.4.41","v4.19.123","v4.14.180","v5.6.12","v5.4.40","v4.19.122","v5.6","v5.6.11","v5.4.39","v4.19.121","v4.14.179","v5.6.10","v5.4.38","v4.19.120","v4.14.178","v5.6.9","v5.4.37","v4.19.119","v4.14.177","v5.6.8","v5.4.36","v5.6.7","v5.4.35","v4.19.118","v4.14.176","v5.6.6","v5.4.34","v4.19.117","v5.6.5","v5.4.33","v4.19.116","v5.6.4","v5.4.32","v4.19.115","v5.6.3","v5.4.31","v4.19.114","v4.14.175","v5.6.2","v5.4.30","v5.6-rc1","v4.14.174","v4.19.113","v5.4.29","v5.6.1","v5.4.28","v5.6-rc7","v5.6-rc6","v5.6-rc3","v5.6-rc4","v5.6-rc2","v5.6-rc5","v5.4.27","v4.19.112","v5.4.26","v4.19.111","v4.14.173","v5.4.25","v4.19.110","v4.19.109","v5.4.24","v4.14.172","v4.19.108","v5.4.23","v4.19.107","v5.4.22","v4.19.106","v4.14.171","v5.4.21","v4.19.105","v5.4.20","v4.19.104","v5.4.19","v4.19.103","v4.14.170","v5.4.18","v4.19.102","v5.5","v5.4.17","v4.19.101","v4.14.169","v5.5-rc5","v4.19.100","v5.4.16","v5.5-rc7","v5.5-rc2","v5.5-rc1","v5.4.15","v4.19.99","v4.14.168","v5.4","v4.19.98","v4.14.167","v5.4.14","v5.5-rc4","v5.4.13","v4.19.97","v4.14.166","v5.5-rc3","v5.5-rc6","v5.4.12","v4.19.96","v4.14.165","v5.4.11","v4.19.95","v4.14.164","v5.4.10","v4.19.94","v4.14.163","v5.4.9","v5.4.8","v4.19.93","v4.14.162","v5.4.7","v4.19.92","v4.14.161","v5.4.6","v4.19.91","v4.14.160","v5.4.5","v4.19.90","v4.14.159","v5.4.4","v4.14.158","v4.19.89","v5.4.3","v4.19.88","v5.4.2","v5.4-rc1","v4.14.157","v4.19.87","v5.4.1","v5.4-rc6","v5.4-rc3","v4.19.86","v4.14.156","v5.4-rc4","v5.4-rc8","v4.14.155","v4.19.85","v4.19.84","v4.14.154","v5.4-rc7","v5.4-rc5","v5.3","v5.4-rc2","v4.19.83","v4.14.153","v4.19.82","v4.14.152","v4.19.81","v4.14.151","v4.19.80","v4.14.150","v4.19.79","v4.14.149","v4.19.78","v4.14.148","v4.19.77","v4.14.147","v4.19.76","v4.14.146","v4.19.75","v5.3-rc5","v5.3-rc1","v4.19.74","v4.14.145","v5.3-rc2","v4.19.73","v4.14.144","v5.3-rc3","v5.3-rc8","v4.19.72","v4.14.143","v5.3-rc7","v5.3-rc4","v4.19.71","v4.14.142","v4.19.70","v4.19.69","v4.14.141","v5.2","v5.3-rc6","v4.19.68","v4.14.140","v4.1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