{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74684","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.926Z","datePublished":"2026-08-22T15:32:50.846Z","dateUpdated":"2026-08-23T12:47:59.515Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-23T12:47:59.515Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tap: set skb->dev 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->dev is null\") fixed a crash in\ntap_get_user() by assigning skb->dev 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->dev. Without the\nassignment, a NULL pointer dereference can occur.\n\nHowever, tap_get_user_xdp() still parses the virtio-net header before\nassigning skb->dev. 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->dev\nis still NULL, resulting in a crash.\n\nFix this by looking up the tap device and assigning skb->dev 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()."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/tap.c"],"versions":[{"version":"924a9bc362a5223cd448ca08c3dde21235adc310","lessThan":"15583b07fd691a844fbf7b3ad612cdc9e9a657c0","status":"affected","versionType":"git"},{"version":"924a9bc362a5223cd448ca08c3dde21235adc310","lessThan":"8b444b126cd8e4473e652f529753ed4dd1360a9c","status":"affected","versionType":"git"},{"version":"924a9bc362a5223cd448ca08c3dde21235adc310","lessThan":"164c31ee252ebd1ac8f44c2dfc5486b6d9a0379b","status":"affected","versionType":"git"},{"version":"924a9bc362a5223cd448ca08c3dde21235adc310","lessThan":"3874892dd27d5387aa9a06f58d9060f18f351d24","status":"affected","versionType":"git"},{"version":"ea3fb2ce5fa794d02135f5c079e05cd6fc3f545d","status":"affected","versionType":"git"},{"version":"54ef8243c3c8e90f1ea5792e6752e021a25c8eb3","status":"affected","versionType":"git"},{"version":"ca278267d6cd9544645731732455b6b20cb0e895","status":"affected","versionType":"git"},{"version":"faa3baa2828c5e1c4374f3e60041f75c64f5fcb6","status":"affected","versionType":"git"},{"version":"99b1d3f74b9ef72c2f74c8e4c078e1bc0706e748","status":"affected","versionType":"git"},{"version":"4.14.226","lessThan":"4.15","status":"affected","versionType":"semver"},{"version":"4.19.181","lessThan":"4.20","status":"affected","versionType":"semver"},{"version":"5.4.106","lessThan":"5.5","status":"affected","versionType":"semver"},{"version":"5.10.24","lessThan":"5.11","status":"affected","versionType":"semver"},{"version":"5.11.7","lessThan":"5.12","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/tap.c"],"versions":[{"version":"5.12","status":"affected"},{"version":"0","lessThan":"5.12","status":"unaffected","versionType":"semver"},{"version":"6.12.105","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.45","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.9","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.12.105"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.18.45"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"7.1.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.226"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.181"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.106"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11.7"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/15583b07fd691a844fbf7b3ad612cdc9e9a657c0"},{"url":"https://git.kernel.org/stable/c/8b444b126cd8e4473e652f529753ed4dd1360a9c"},{"url":"https://git.kernel.org/stable/c/164c31ee252ebd1ac8f44c2dfc5486b6d9a0379b"},{"url":"https://git.kernel.org/stable/c/3874892dd27d5387aa9a06f58d9060f18f351d24"}],"title":"net: tap: set skb->dev before parsing virtio net header in tap_get_user_xdp()","x_generator":{"engine":"bippy-1.2.0"}}}}