{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74283", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.881Z", "datePublished": "2026-08-15T05:57:52.667Z", "dateUpdated": "2026-08-17T05:45:24.502Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:45:24.502Z" }, "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." } ], "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/tipc/netlink.c" ], "versions": [ { "version": "0655f6a8635b1b66f2434d5556b1044c14b1ccaf", "lessThan": "b06fb5f78a9af0929aaa47c92d0b7bca0617fb25", "status": "affected", "versionType": "git" }, { "version": "0655f6a8635b1b66f2434d5556b1044c14b1ccaf", "lessThan": "52864c6c13dcc292481eabfeb3c31a86c3ec06f2", "status": "affected", "versionType": "git" }, { "version": "0655f6a8635b1b66f2434d5556b1044c14b1ccaf", "lessThan": "e87dcc1a644d087de0bb6c94c6dd28c29b89597f", "status": "affected", "versionType": "git" }, { "version": "0655f6a8635b1b66f2434d5556b1044c14b1ccaf", "lessThan": "9b937de4b3ded62a24da6e8d9d623cdb2748fa74", "status": "affected", "versionType": "git" }, { "version": "0655f6a8635b1b66f2434d5556b1044c14b1ccaf", "lessThan": "c9668a4adb2264625daeeabc7466b783badd4614", "status": "affected", "versionType": "git" }, { "version": "0655f6a8635b1b66f2434d5556b1044c14b1ccaf", "lessThan": "cebaefe1aceb650d5c99a4c0e1a4dde09e211818", "status": "affected", "versionType": "git" }, { "version": "0655f6a8635b1b66f2434d5556b1044c14b1ccaf", "lessThan": "56f0a2e0a1d004e025cd031c3a801ab73959269f", "status": "affected", "versionType": "git" }, { "version": "0655f6a8635b1b66f2434d5556b1044c14b1ccaf", "lessThan": "86b0c540e2ea397cde021eecd24145f7c16a3d4e", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/tipc/netlink.c" ], "versions": [ { "version": "3.19", "status": "affected" }, { "version": "0", "lessThan": "3.19", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "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": "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" } ] } ] } ], "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" } ], "title": "tipc: require net admin for TIPCv2 netlink mutators", "x_generator": { "engine": "bippy-1.2.0" } } } }