{"id":"CVE-2026-74283","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-74283","summary":"tipc: require net admin for TIPCv2 netlink mutators","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: require net admin for TIPCv2 netlink mutators\n\nTIPCv2 registers mutating generic-netlink operations without admin\npermission flags. Generic netlink only checks CAP_NET_ADMIN when an\noperation sets GENL_ADMIN_PERM or GENL_UNS_ADMIN_PERM, so a local\nunprivileged process can currently change TIPC state through commands\nsuch as TIPC_NL_NET_SET, TIPC_NL_KEY_SET, TIPC_NL_KEY_FLUSH, and\nbearer enable/disable.\n\nThe legacy TIPC netlink API already checks netlink_net_capable(...,\nCAP_NET_ADMIN) for administrative commands. Give the TIPCv2 mutators\nthe equivalent generic-netlink gate. Use GENL_UNS_ADMIN_PERM, which\nmaps to the same namespace-aware CAP_NET_ADMIN check that\nnetlink_net_capable() performs, so the behaviour matches the legacy\npath and keeps working for CAP_NET_ADMIN holders in a non-initial user\nnamespace (containers).\n\nA QEMU/KASAN repro run as uid/gid 65534 with zero effective\ncapabilities previously succeeded in changing the network id and node\nidentity, setting and flushing key material, and enabling/disabling a\nUDP bearer. With this patch applied the same operations fail with\n-EPERM.","published":"2026-08-15T05:57:52.667Z","modified":"2026-08-18T03:56:56.822002099Z","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"5.10.261"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/52864c6c13dcc292481eabfeb3c31a86c3ec06f2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/56f0a2e0a1d004e025cd031c3a801ab73959269f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/86b0c540e2ea397cde021eecd24145f7c16a3d4e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9b937de4b3ded62a24da6e8d9d623cdb2748fa74"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b06fb5f78a9af0929aaa47c92d0b7bca0617fb25"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c9668a4adb2264625daeeabc7466b783badd4614"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cebaefe1aceb650d5c99a4c0e1a4dde09e211818"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e87dcc1a644d087de0bb6c94c6dd28c29b89597f"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74283.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74283"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T03:56:56.822002099Z"}}