{"id":"CVE-2026-74283","state":"PUBLISHED","title":"tipc: require net admin for TIPCv2 netlink mutators","description":"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.","publishedAt":"2026-08-15T05:57:52.667Z","updatedAt":"2026-10-16T18:55:30.055Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0655f6a8635b1b66f2434d5556b1044c14b1ccaf","status":"affected","lessThan":"b06fb5f78a9af0929aaa47c92d0b7bca0617fb25","versionType":"git"},{"version":"0655f6a8635b1b66f2434d5556b1044c14b1ccaf","status":"affected","lessThan":"52864c6c13dcc292481eabfeb3c31a86c3ec06f2","versionType":"git"},{"version":"0655f6a8635b1b66f2434d5556b1044c14b1ccaf","status":"affected","lessThan":"e87dcc1a644d087de0bb6c94c6dd28c29b89597f","versionType":"git"},{"version":"0655f6a8635b1b66f2434d5556b1044c14b1ccaf","status":"affected","lessThan":"9b937de4b3ded62a24da6e8d9d623cdb2748fa74","versionType":"git"},{"version":"0655f6a8635b1b66f2434d5556b1044c14b1ccaf","status":"affected","lessThan":"c9668a4adb2264625daeeabc7466b783badd4614","versionType":"git"},{"version":"0655f6a8635b1b66f2434d5556b1044c14b1ccaf","status":"affected","lessThan":"cebaefe1aceb650d5c99a4c0e1a4dde09e211818","versionType":"git"},{"version":"0655f6a8635b1b66f2434d5556b1044c14b1ccaf","status":"affected","lessThan":"56f0a2e0a1d004e025cd031c3a801ab73959269f","versionType":"git"},{"version":"0655f6a8635b1b66f2434d5556b1044c14b1ccaf","status":"affected","lessThan":"86b0c540e2ea397cde021eecd24145f7c16a3d4e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/tipc/netlink.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.19","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/tipc/netlink.c"]}],"references":["https://git.kernel.org/stable/c/b06fb5f78a9af0929aaa47c92d0b7bca0617fb25","https://git.kernel.org/stable/c/52864c6c13dcc292481eabfeb3c31a86c3ec06f2","https://git.kernel.org/stable/c/e87dcc1a644d087de0bb6c94c6dd28c29b89597f","https://git.kernel.org/stable/c/9b937de4b3ded62a24da6e8d9d623cdb2748fa74","https://git.kernel.org/stable/c/c9668a4adb2264625daeeabc7466b783badd4614","https://git.kernel.org/stable/c/cebaefe1aceb650d5c99a4c0e1a4dde09e211818","https://git.kernel.org/stable/c/56f0a2e0a1d004e025cd031c3a801ab73959269f","https://git.kernel.org/stable/c/86b0c540e2ea397cde021eecd24145f7c16a3d4e"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74283.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74283","state":"PUBLISHED","datePublished":"2026-08-15T05:57:52.667Z","dateUpdated":"2026-10-16T18:55:30.055Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.881Z"},"containers":{"cna":{"title":"tipc: require net admin for TIPCv2 netlink mutators","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0655f6a8635b1b66f2434d5556b1044c14b1ccaf","status":"affected","lessThan":"b06fb5f78a9af0929aaa47c92d0b7bca0617fb25","versionType":"git"},{"version":"0655f6a8635b1b66f2434d5556b1044c14b1ccaf","status":"affected","lessThan":"52864c6c13dcc292481eabfeb3c31a86c3ec06f2","versionType":"git"},{"version":"0655f6a8635b1b66f2434d5556b1044c14b1ccaf","status":"affected","lessThan":"e87dcc1a644d087de0bb6c94c6dd28c29b89597f","versionType":"git"},{"version":"0655f6a8635b1b66f2434d5556b1044c14b1ccaf","status":"affected","lessThan":"9b937de4b3ded62a24da6e8d9d623cdb2748fa74","versionType":"git"},{"version":"0655f6a8635b1b66f2434d5556b1044c14b1ccaf","status":"affected","lessThan":"c9668a4adb2264625daeeabc7466b783badd4614","versionType":"git"},{"version":"0655f6a8635b1b66f2434d5556b1044c14b1ccaf","status":"affected","lessThan":"cebaefe1aceb650d5c99a4c0e1a4dde09e211818","versionType":"git"},{"version":"0655f6a8635b1b66f2434d5556b1044c14b1ccaf","status":"affected","lessThan":"56f0a2e0a1d004e025cd031c3a801ab73959269f","versionType":"git"},{"version":"0655f6a8635b1b66f2434d5556b1044c14b1ccaf","status":"affected","lessThan":"86b0c540e2ea397cde021eecd24145f7c16a3d4e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/tipc/netlink.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.19","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/tipc/netlink.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/b06fb5f78a9af0929aaa47c92d0b7bca0617fb25"},{"url":"https://git.kernel.org/stable/c/52864c6c13dcc292481eabfeb3c31a86c3ec06f2"},{"url":"https://git.kernel.org/stable/c/e87dcc1a644d087de0bb6c94c6dd28c29b89597f"},{"url":"https://git.kernel.org/stable/c/9b937de4b3ded62a24da6e8d9d623cdb2748fa74"},{"url":"https://git.kernel.org/stable/c/c9668a4adb2264625daeeabc7466b783badd4614"},{"url":"https://git.kernel.org/stable/c/cebaefe1aceb650d5c99a4c0e1a4dde09e211818"},{"url":"https://git.kernel.org/stable/c/56f0a2e0a1d004e025cd031c3a801ab73959269f"},{"url":"https://git.kernel.org/stable/c/86b0c540e2ea397cde021eecd24145f7c16a3d4e"}],"metrics":[{"cvssV3_1":{"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"},"scenarios":[{"lang":"en","value":"AV:L - Exploitation requires sending TIPCv2 generic-netlink commands via a local NETLINK_GENERIC socket; the flaw is a missing authorization check on netlink mutators, not remote packet handling in the TIPC data plane.\nAC:L - Any unprivileged local process can open a generic-netlink socket and invoke the unprotected TIPCv2 mutators deterministically; no races, special memory layout, or victim state are required beyond TIPC being loaded.\nPR:L - The fix commit reproduces the issue as uid/gid 65534 (nobody) with zero effective capabilities; no CAP_NET_ADMIN or root in the initial namespace is needed, only standard local user access.\nUI:N - No victim interaction is required; the attacker directly issues netlink configuration commands to alter TIPC cluster state.\nS:U - Impact is unauthorized kernel/TIPC administration within the caller’s network namespace (and global media tuning), not crossing a VM, container-to-host, or other distinct security-authority boundary.\nC:H - Unprivileged callers can set or flush TIPC AEAD encryption keys and reconfigure node/network identity, enabling decryption or exposure of protected inter-node cluster traffic that should require administrator control.\nI:H - Attackers can arbitrarily modify TIPC network ID, node identity, bearer/link/media parameters, monitoring settings, and cluster peer state, subverting intended cluster topology and cryptographic configuration.\nA:H - Unprivileged bearer disable/enable, peer removal, and key flush operations can repeatedly disrupt or partition TIPC cluster connectivity and encrypted communication, causing sustained denial of cluster service."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:45:24.502Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-74283","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T18:52:09.795417Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T18:55:30.055Z"}}]}}}