CVE-2026-68294 (GCVE-0-2026-68294)
Vulnerability from cvelistv5
Published
2026-08-10 12:02
Modified
2026-10-19 21:09
Severity ?
8.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: qrtr: restrict socket creation to the initial network namespace QRTR keeps its entire port and node state in module-global variables that are not partitioned per network namespace: qrtr_local_nid is a single global node id (always 1) and qrtr_ports is a single global xarray. qrtr_port_lookup() and qrtr_local_enqueue() operate on that global state with no network-namespace check, and qrtr_create() places no restriction on the namespace a socket is created in. As a result an unprivileged process that creates an AF_QIPCRTR socket in a separate network namespace, e.g. via unshare(CLONE_NEWUSER | CLONE_NEWNET), can send QRTR datagrams - including control-plane messages such as QRTR_TYPE_NEW_SERVER - to QRTR sockets owned by another namespace, and vice versa. The receiving socket sees such a message as coming from node id 1, indistinguishable from a legitimate local client, breaking the isolation that network namespaces are expected to provide. QRTR is a transport to global hardware endpoints (the modem and other remote processors) and has no per-namespace semantics; its in-kernel name service already creates its socket in init_net only. Confine the socket family to the initial network namespace, as other non-namespace-aware socket families do (see llc_ui_create() and the ieee802154 socket code).
References
Impacted products
Vendor Product Version
Linux Linux Version: bdabad3e363d825ddf9679dd431cca0b2c30f881
Version: bdabad3e363d825ddf9679dd431cca0b2c30f881
Version: bdabad3e363d825ddf9679dd431cca0b2c30f881
Version: bdabad3e363d825ddf9679dd431cca0b2c30f881
Version: bdabad3e363d825ddf9679dd431cca0b2c30f881
Version: bdabad3e363d825ddf9679dd431cca0b2c30f881
Version: bdabad3e363d825ddf9679dd431cca0b2c30f881
Version: bdabad3e363d825ddf9679dd431cca0b2c30f881
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No race, no memory-layout dependency, no victim state required.\\nPR:L - Any unprivileged local user can create the required network namespace via unshare(CLONE_NEWUSER|CLONE_NEWNET), and a containerized process is already in one; the CAP_NET_ADMIN check at qrtr_port_assign() only gates low/control ports and is not needed for this attack.\\nUI:N - The attacker performs all steps itself; no action by any other user or administrator is required to trigger the cross-namespace delivery.\\nS:C - The flaw defeats the network-namespace confinement boundary itself: a process sandboxed in its own netns reaches the init_net global QRTR control plane, the in-kernel name service, and host-owned sockets, impacting resources under a different security authority than the attacker\u0027s container.\\nC:H - By spoofing QRTR_TYPE_NEW_SERVER to the name service, a confined attacker registers itself as a well-known service so legitimate host clients direct their QMI traffic to it, and it can address 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check, and qrtr_create() places\\nno restriction on the namespace a socket is created in.\\n\\nAs a result an unprivileged process that creates an AF_QIPCRTR socket\\nin a separate network namespace, e.g. via\\nunshare(CLONE_NEWUSER | CLONE_NEWNET), can send QRTR datagrams -\\nincluding control-plane messages such as QRTR_TYPE_NEW_SERVER - to QRTR\\nsockets owned by another namespace, and vice versa. The receiving\\nsocket sees such a message as coming from node id 1, indistinguishable\\nfrom a legitimate local client, breaking the isolation that network\\nnamespaces are expected to provide.\\n\\nQRTR is a transport to global hardware endpoints (the modem and other\\nremote processors) and has no per-namespace semantics; its in-kernel\\nname service already creates its socket in init_net only. Confine the\\nsocket family to the initial network namespace, as other\\nnon-namespace-aware socket families do (see llc_ui_create() and the\\nieee802154 socket code).\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.265\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.216\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.148\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.101\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.42\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.6\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"4.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-19T16:32:43.629Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-68294\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T21:09:03.595Z\", \"dateReserved\": \"2026-07-30T09:28:09.380Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-10T12:02:27.423Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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