{"api_version":"1","generated_at":"2026-10-27T11:55:21+00:00","cve":"CVE-2026-74627","urls":{"html":"https://cve.report/CVE-2026-74627","api":"https://cve.report/api/cve/CVE-2026-74627.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74627","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74627"},"summary":{"title":"net: devmem: prevent net-iov / page mixing","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: devmem: prevent net-iov / page mixing\n\nWe should either have net_iov or page backed frags in a single skb,\notherwise it blows up down the stack. Don't allow mixing in\nzerocopy_fill_skb_from_devmem().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-22 16:16:35","updated_at":"2026-10-14 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the Linux kernel, the following vulnerability has been resolved:\n\nnet: devmem: prevent net-iov / page mixing\n\nWe should either have net_iov or page backed frags in a single skb,\notherwise it blows up down the stack. Don't allow mixing in\nzerocopy_fill_skb_from_devmem()."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The bug is in zerocopy_fill_skb_from_devmem() reached only via local sendmsg() on TCP sockets (tcp_sendmsg_locked -> skb_zerocopy_iter_stream -> __zerocopy_sg_from_iter); remote peers cannot invoke this skb construction path without local process cooperation.\nAC:L - An attacker reliably triggers mixing by partially filling the TCP write-queue tail skb with page-backed zerocopy or copy data, then issuing MSG_ZEROCOPY+SCM_DEVMEM_DMABUF sendmsg on the same skb; no race or uncontrollable layout is required.\nPR:L - Exploitation requires SOCK_ZEROCOPY, netdev-genl NETDEV_CMD_BIND_TX dmabuf binding, and a netmem_tx-capable NIC; CAP_NET_ADMIN for netdev/dmabuf setup is obtainable inside user/network namespaces via unshare without init-namespace root.\nUI:N - No victim file open, mount, or interactive action is needed; the attacker configures devmem TX binding and drives the crafted sendmsg sequence on their own TCP socket.\nS:U - Impact is kernel frag-type confusion and faults during local TX processing on the same host; it does not cross VM, container, or IOMMU security boundaries to a different authority.\nC:H - Mixing page-backed and net_iov frags violates skb unreadability invariants; downstream frag walkers that assume uniform backing can dereference invalid pages via skb_frag_foreach_page, enabling kernel memory disclosure primitives.\nI:H - Creating an skb with both page and net_iov fragments is explicit frag-type confusion; the stack cannot safely manage mixed backing types, and corrupted skb metadata/refcounts can be leveraged for arbitrary kernel writes or control-flow hijacking.\nA:H - The fix commit states mixed frags blow up down the stack; malformed skbs reaching TX, checksum, GSO, or frag-unref paths can trigger kernel oops/panic on netmem_tx deployments (cloud/HPC mlx5, bnxt, gve hosts)."}]}],"providerMetadata":{"dateUpdated":"2026-08-25T05:40:50.784Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/e9bfe12b1d04c34c6fedcba21d9709b65c08aa33"},{"url":"https://git.kernel.org/stable/c/ed08011ae0be88f16cceae190535d6c790c83b0c"},{"url":"https://git.kernel.org/stable/c/53a43508ee332d8bffe40590c3d189c92a551f9f"}],"title":"net: devmem: prevent net-iov / page mixing","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74627","datePublished":"2026-08-22T15:32:09.405Z","dateReserved":"2026-08-15T05:44:03.921Z","dateUpdated":"2026-08-25T05:40:50.784Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-22 16:16:35","lastModifiedDate":"2026-10-14 13:10:00","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74627","Ordinal":"1","Title":"net: devmem: prevent net-iov / page mixing","CVE":"CVE-2026-74627","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74627","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: devmem: prevent net-iov / page mixing\n\nWe should either have net_iov or page backed frags in a single skb,\notherwise it blows up down the stack. Don't allow mixing in\nzerocopy_fill_skb_from_devmem().","Type":"Description","Title":"net: devmem: prevent net-iov / page mixing"}]}}}