{"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": "2026-08-22T15:32:50.846Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-22T15:32:50.846Z"}, "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": "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": "6.18.45", "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": "6.18.45"}, {"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/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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/tap.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8b444b126cd8e4473e652f529753ed4dd1360a9c", "status": "affected", "version": "924a9bc362a5223cd448ca08c3dde21235adc310", "versionType": "git"}, {"lessThan": "164c31ee252ebd1ac8f44c2dfc5486b6d9a0379b", "status": "affected", "version": "924a9bc362a5223cd448ca08c3dde21235adc310", "versionType": "git"}, {"lessThan": "3874892dd27d5387aa9a06f58d9060f18f351d24", "status": "affected", "version": "924a9bc362a5223cd448ca08c3dde21235adc310", "versionType": "git"}, {"status": "affected", "version": "ea3fb2ce5fa794d02135f5c079e05cd6fc3f545d", "versionType": "git"}, {"status": "affected", "version": "54ef8243c3c8e90f1ea5792e6752e021a25c8eb3", "versionType": "git"}, {"status": "affected", "version": "ca278267d6cd9544645731732455b6b20cb0e895", "versionType": "git"}, {"status": "affected", "version": "faa3baa2828c5e1c4374f3e60041f75c64f5fcb6", "versionType": "git"}, {"status": "affected", "version": "99b1d3f74b9ef72c2f74c8e4c078e1bc0706e748", "versionType": "git"}, {"lessThan": "4.15", "status": "affected", "version": "4.14.226", "versionType": "semver"}, {"lessThan": "4.20", "status": "affected", "version": "4.19.181", "versionType": "semver"}, {"lessThan": "5.5", "status": "affected", "version": "5.4.106", "versionType": "semver"}, {"lessThan": "5.11", "status": "affected", "version": "5.10.24", "versionType": "semver"}, {"lessThan": "5.12", "status": "affected", "version": "5.11.7", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/tap.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.12"}, {"lessThan": "5.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.45", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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()."}], "id": "CVE-2026-74684", "lastModified": "2026-08-22T16:16:42.757", "metrics": {}, "published": "2026-08-22T16:16:42.757", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/164c31ee252ebd1ac8f44c2dfc5486b6d9a0379b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3874892dd27d5387aa9a06f58d9060f18f351d24"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8b444b126cd8e4473e652f529753ed4dd1360a9c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

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