{"id":"CVE-2026-74684","summary":"net: tap: set skb-\u003edev before parsing virtio net header in tap_get_user_xdp()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tap: set skb-\u003edev before parsing virtio net header in tap_get_user_xdp()\n\nThe commit 4f61f133f354 (\"net: tap: NULL pointer derefence in\ndev_parse_header_protocol when skb-\u003edev is null\") fixed a crash in\ntap_get_user() by assigning skb-\u003edev before calling tun_vnet_hdr_to_skb().\nThis is required because virtio_net_hdr_to_skb() may invoke\ndev_parse_header_protocol(), which dereferences skb-\u003edev. Without the\nassignment, a NULL pointer dereference can occur.\n\nHowever, tap_get_user_xdp() still parses the virtio-net header before\nassigning skb-\u003edev. When the vhost TX path passes an XDP buffer containing\na GSO virtio-net header but the protocol is set to zero on purpose,\ntun_vnet_hdr_to_skb() can reach dev_parse_header_protocol() while skb-\u003edev\nis still NULL, resulting in a crash.\n\nFix this by looking up the tap device and assigning skb-\u003edev before calling\ntun_vnet_hdr_to_skb(), matching the ordering already used in\ntap_get_user(). Preserve the existing RCU read-side critical section across\ndev_queue_xmit().","modified":"2026-11-01T02:30:50.810660708Z","published":"2026-08-22T15:32:50.846Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74684.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/15583b07fd691a844fbf7b3ad612cdc9e9a657c0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/164c31ee252ebd1ac8f44c2dfc5486b6d9a0379b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1d022885f3e6e0e238815391a4afaf3a4fb0a442"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3874892dd27d5387aa9a06f58d9060f18f351d24"},{"type":"WEB","url":"https://git.kernel.org/stable/c/61dd022c55c7307ec119e5672cb141cccbecf3b1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8b444b126cd8e4473e652f529753ed4dd1360a9c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74684.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74684"},{"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":"924a9bc362a5223cd448ca08c3dde21235adc310"},{"fixed":"1d022885f3e6e0e238815391a4afaf3a4fb0a442"},{"fixed":"61dd022c55c7307ec119e5672cb141cccbecf3b1"},{"fixed":"15583b07fd691a844fbf7b3ad612cdc9e9a657c0"},{"fixed":"8b444b126cd8e4473e652f529753ed4dd1360a9c"},{"fixed":"164c31ee252ebd1ac8f44c2dfc5486b6d9a0379b"},{"fixed":"3874892dd27d5387aa9a06f58d9060f18f351d24"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.14.226"},{"fixed":"4.15"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.19.181"},{"fixed":"4.20"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.4.106"},{"fixed":"5.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.10.24"},{"fixed":"5.11"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.11.7"},{"fixed":"5.12"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ea3fb2ce5fa794d02135f5c079e05cd6fc3f545d"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"54ef8243c3c8e90f1ea5792e6752e021a25c8eb3"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ca278267d6cd9544645731732455b6b20cb0e895"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"faa3baa2828c5e1c4374f3e60041f75c64f5fcb6"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"99b1d3f74b9ef72c2f74c8e4c078e1bc0706e748"}]}],"versions":["v4.14.336","v4.14.335","v4.14.334","v4.14.333","v4.14.332","v4.14.331","v4.14.330","v4.14.329","v4.14.328","v4.14.327","v4.14.326","v4.14.325","v4.14.324","v4.14.323","v4.14.322","v4.14.321","v4.14.320","v4.14.319","v4.14.318","v4.14.317","v4.14.316","v4.14.315","v4.14.314","v4.14.313","v4.14.312","v4.14.311","v4.14.310","v4.14.309","v4.14.308","v4.14.307","v4.14.306","v4.14.305","v4.14.304","v4.14.303","v4.14.302","v4.14.301","v4.14.300","v4.14.299","v4.14.298","v4.14.297","v4.14.296","v4.14.295","v4.14.294","v4.14.293","v4.14.292","v4.14.291","v4.14.290","v4.14.289","v4.14.288","v4.14.287","v4.14.286","v4.14.285","v4.14.284","v4.14.283","v4.14.282","v4.14.281","v4.14.280","v4.14.279","v4.14.278","v4.14.277","v4.14.276","v4.14.275","v4.14.274","v4.14.273","v4.14.272","v4.14.271","v4.14.270","v4.14.269","v4.14.268","v4.14.267","v4.14.266","v4.14.265","v4.14.264","v4.14.263","v4.14.262","v4.14.261","v4.14.260","v4.14.259","v4.14.258","v4.14.257","v4.14.256","v4.14.255","v4.14.254","v4.14.253","v4.14.252","v4.14.251","v4.14.250","v4.14.249","v4.14.248","v4.14.247","v4.14.246","v4.14.245","v4.14.244","v4.14.243","v4.14.242","v4.14.241","v4.14.240","v4.14.239","v4.14.238","v4.14.237","v4.14.236","v4.14.235","v4.14.234","v4.14.233","v4.14.232","v4.14.231","v4.14.230","v4.14.229","v4.14.228","v4.14.227","v4.14.226","v4.19.325","v4.19.324","v4.19.323","v4.19.322","v4.19.321","v4.19.320","v4.19.319","v4.19.318","v4.19.317","v4.19.316","v4.19.315","v4.19.314","v4.19.313","v4.19.312","v4.19.311","v4.19.310","v4.19.309","v4.19.308","v4.19.307","v4.19.306","v4.19.305","v4.19.304","v4.19.303","v4.19.302","v4.19.301","v4.19.300","v4.19.299","v4.19.298","v4.19.297","v4.19.296","v4.19.295","v4.19.294","v4.19.293","v4.19.292","v4.19.291","v4.19.290","v4.19.289","v4.19.288","v4.19.287","v4.19.286","v4.19.285","v4.19.284","v4.19.283","v4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