CVE-2026-68294 (GCVE-0-2026-68294)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:02 – Updated: 2026-08-19 16:32
VLAI
Title
net: qrtr: restrict socket creation to the initial network namespace
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).
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bdabad3e363d825ddf9679dd431cca0b2c30f881 , < 7814f6a3415cad38aa8d6dfc573df778260d66aa (git)
Affected: bdabad3e363d825ddf9679dd431cca0b2c30f881 , < 2d22b94a154ccb9755dddfff802fe3e2b1adbab5 (git)
Affected: bdabad3e363d825ddf9679dd431cca0b2c30f881 , < 8d351fe0654a20c9f95a61b05d24ebe6d4be3fbb (git)
Affected: bdabad3e363d825ddf9679dd431cca0b2c30f881 , < 4b95e1f0d6e6342c427cb341ee18a894b146b789 (git)
Affected: bdabad3e363d825ddf9679dd431cca0b2c30f881 , < f488116df769bdaf89c93371350e49e12133e70f (git)
Affected: bdabad3e363d825ddf9679dd431cca0b2c30f881 , < 8150c48fb978e01689f94ed80148f8a7499ae571 (git)
Affected: bdabad3e363d825ddf9679dd431cca0b2c30f881 , < 659b9b4f194bb56b9903cc95e786ef1d438baa7d (git)
Affected: bdabad3e363d825ddf9679dd431cca0b2c30f881 , < 3b536db8fb32da9e9c62f2bb45e2e319331f0426 (git)
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Linux Linux Affected: 4.7
Unaffected: 0 , < 4.7 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qrtr: restrict socket creation to the initial network namespace\n\nQRTR keeps its entire port and node state in module-global variables\nthat are not partitioned per network namespace: qrtr_local_nid is a\nsingle global node id (always 1) and qrtr_ports is a single global\nxarray. qrtr_port_lookup() and qrtr_local_enqueue() operate on that\nglobal state with no network-namespace 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)."
        }
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            "baseSeverity": "HIGH",
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            "version": "3.1"
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              "value": "AV:L - Exploitation requires local access to issue socket()/sendmsg() syscalls on an AF_QIPCRTR socket from within a network namespace on the target system; there is no remote packet path into qrtr_create().\nAC:L - The attack is fully deterministic: unshare(CLONE_NEWUSER|CLONE_NEWNET), create an AF_QIPCRTR socket (module autoloads via net-pf-42), and sendmsg() to node 1. 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 modem/remote-processor endpoints directly, exposing sensitive telephony data it was isolated from.\nI:H - The attacker can inject arbitrary control-plane messages (NEW_SERVER, DEL_SERVER, BYE, DEL_CLIENT) that the receiver cannot distinguish from a legitimate node-1 client, corrupting the global service registry and allowing forged replies to host clients and commands to the modem.\nA:H - A single spoofed QRTR_TYPE_BYE makes ctrl_cmd_bye() delete every server registered on the local node and broadcast their removal, and the QRTR_NS_MAX_SERVERS/MAX_LOOKUPS limits can be exhausted, causing complete and repeatable loss of QRTR/modem IPC service for the whole system."
            }
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        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        {
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      "title": "net: qrtr: restrict socket creation to the initial network namespace",
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    "cveId": "CVE-2026-68294",
    "datePublished": "2026-08-10T12:02:27.423Z",
    "dateReserved": "2026-07-30T09:28:09.380Z",
    "dateUpdated": "2026-08-19T16:32:43.629Z",
    "state": "PUBLISHED"
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qrtr: restrict socket creation to the initial network namespace\n\nQRTR keeps its entire port and node state in module-global variables\nthat are not partitioned per network namespace: qrtr_local_nid is a\nsingle global node id (always 1) and qrtr_ports is a single global\nxarray. qrtr_port_lookup() and qrtr_local_enqueue() operate on that\nglobal state with no network-namespace 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)."
          }
        ],
        "id": "CVE-2026-68294",
        "lastModified": "2026-08-19T17:20:40.730",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.0,
              "impactScore": 6.0,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-08-10T13:20:18.820",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2d22b94a154ccb9755dddfff802fe3e2b1adbab5"
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f488116df769bdaf89c93371350e49e12133e70f"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-17T11:46:11+00:00",
      "cve": "CVE-2026-68294",
      "id": "CVE-2026-68294",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:fixed": "642",
      "product_status:known_affected": "54",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: qrtr: restrict socket creation to the initial network namespace",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68294.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-19T01:51:02Z",
      "cve": "CVE-2026-68294",
      "id": "CVE-2026-68294",
      "initial_release_date": "2026-08-14T17:14:35Z",
      "product_status:known_affected": "368",
      "product_status:known_not_affected": "6",
      "product_status:recommended": "83",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68294",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68294.json",
      "version": "7"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.