CVE-2026-74283 (GCVE-0-2026-74283)
Vulnerability from cvelistv5
Published
2026-08-15 05:57
Modified
2026-10-16 18:55
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: tipc: require net admin for TIPCv2 netlink mutators TIPCv2 registers mutating generic-netlink operations without admin permission flags. Generic netlink only checks CAP_NET_ADMIN when an operation sets GENL_ADMIN_PERM or GENL_UNS_ADMIN_PERM, so a local unprivileged process can currently change TIPC state through commands such as TIPC_NL_NET_SET, TIPC_NL_KEY_SET, TIPC_NL_KEY_FLUSH, and bearer enable/disable. The legacy TIPC netlink API already checks netlink_net_capable(..., CAP_NET_ADMIN) for administrative commands. Give the TIPCv2 mutators the equivalent generic-netlink gate. Use GENL_UNS_ADMIN_PERM, which maps to the same namespace-aware CAP_NET_ADMIN check that netlink_net_capable() performs, so the behaviour matches the legacy path and keeps working for CAP_NET_ADMIN holders in a non-initial user namespace (containers). A QEMU/KASAN repro run as uid/gid 65534 with zero effective capabilities previously succeeded in changing the network id and node identity, setting and flushing key material, and enabling/disabling a UDP bearer. With this patch applied the same operations fail with -EPERM.
References
Impacted products
Vendor Product Version
Linux Linux Version: 0655f6a8635b1b66f2434d5556b1044c14b1ccaf
Version: 0655f6a8635b1b66f2434d5556b1044c14b1ccaf
Version: 0655f6a8635b1b66f2434d5556b1044c14b1ccaf
Version: 0655f6a8635b1b66f2434d5556b1044c14b1ccaf
Version: 0655f6a8635b1b66f2434d5556b1044c14b1ccaf
Version: 0655f6a8635b1b66f2434d5556b1044c14b1ccaf
Version: 0655f6a8635b1b66f2434d5556b1044c14b1ccaf
Version: 0655f6a8635b1b66f2434d5556b1044c14b1ccaf
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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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"3.19\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T05:45:24.502Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-74283\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T18:55:30.055Z\", \"dateReserved\": \"2026-08-15T05:44:03.881Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T05:57:52.667Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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