{"id":"CVE-2026-74701","summary":"net/openvswitch: check Ethernet header length in key_extract()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/openvswitch: check Ethernet header length in key_extract()\n\nWhen a packet arrives on an ARPHRD_NONE device (e.g. TUN),\novs_flow_key_extract() trusts the user-provided skb-\u003eprotocol field: if\nit is ETH_P_TEB, the packet is classified as MAC_PROTO_ETHERNET and\nkey_extract() is called without ensuring the skb has ETH_HLEN (14) bytes\nof linear data. key_extract() unconditionally pulls 2 * ETH_ALEN bytes\nfor MAC addresses and parse_ethertype() pulls 2 more, either of which\ntriggers a kernel BUG in __skb_pull() when the linear area is too small.\n\n  kernel BUG at include/linux/skbuff.h:2848!\n  RIP: 0010:key_extract+0xa7e/0xd90 net/openvswitch/flow.c:933\n  ovs_flow_key_extract+0x419/0xa70\n  ovs_vport_receive+0x222/0x390\n  netdev_frame_hook+0x3e0/0x630\n  tun_get_user+0x2d0c/0x38e0\n\nFixed by calling check_header() in key_extract() before accessing the\nEthernet header.","modified":"2026-08-24T11:47:21.827480517Z","published":"2026-08-22T15:33:01.585Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74701.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0b60b55652ba772b173dddc63f3851e1d2dd5927"},{"type":"WEB","url":"https://git.kernel.org/stable/c/81f9b09f0ea3ba9ab966dd17e9f32625a14555e9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/831471718f6e19aed1a330b03b53190a90e06466"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9b8cfbb58b85bfa7a78fac47fdc77396cd01f699"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a8139285c8925efe59af28a9169bb2fda91bff15"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cf6f8b29befb92173659bcef6a441d274947bfae"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d8bea341b183190ce6c055ab0e64ab78eb9a7290"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e85278afd4890dd190ba3c7a1b1a712b801c9fe1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74701.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74701"},{"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":"217ac77a3c2524d999730b2a80b61fcc2d0f734a"},{"fixed":"e85278afd4890dd190ba3c7a1b1a712b801c9fe1"},{"fixed":"81f9b09f0ea3ba9ab966dd17e9f32625a14555e9"},{"fixed":"831471718f6e19aed1a330b03b53190a90e06466"},{"fixed":"d8bea341b183190ce6c055ab0e64ab78eb9a7290"},{"fixed":"0b60b55652ba772b173dddc63f3851e1d2dd5927"},{"fixed":"a8139285c8925efe59af28a9169bb2fda91bff15"},{"fixed":"9b8cfbb58b85bfa7a78fac47fdc77396cd01f699"},{"fixed":"cf6f8b29befb92173659bcef6a441d274947bfae"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74701.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.10.0"},{"fixed":"5.10.265"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.216"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.152"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.104"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.45"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74701.json"}}],"schema_version":"1.9.0"}