{"id":"CVE-2026-68294","state":"PUBLISHED","title":"net: qrtr: restrict socket creation to the initial network namespace","description":"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).","publishedAt":"2026-08-10T12:02:27.423Z","updatedAt":"2026-10-19T21:09:03.595Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","status":"affected","lessThan":"7814f6a3415cad38aa8d6dfc573df778260d66aa","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","status":"affected","lessThan":"2d22b94a154ccb9755dddfff802fe3e2b1adbab5","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","status":"affected","lessThan":"8d351fe0654a20c9f95a61b05d24ebe6d4be3fbb","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","status":"affected","lessThan":"4b95e1f0d6e6342c427cb341ee18a894b146b789","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","status":"affected","lessThan":"f488116df769bdaf89c93371350e49e12133e70f","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","status":"affected","lessThan":"8150c48fb978e01689f94ed80148f8a7499ae571","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","status":"affected","lessThan":"659b9b4f194bb56b9903cc95e786ef1d438baa7d","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","status":"affected","lessThan":"3b536db8fb32da9e9c62f2bb45e2e319331f0426","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/qrtr/af_qrtr.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.7","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","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/qrtr/af_qrtr.c"]}],"references":["https://git.kernel.org/stable/c/7814f6a3415cad38aa8d6dfc573df778260d66aa","https://git.kernel.org/stable/c/2d22b94a154ccb9755dddfff802fe3e2b1adbab5","https://git.kernel.org/stable/c/8d351fe0654a20c9f95a61b05d24ebe6d4be3fbb","https://git.kernel.org/stable/c/4b95e1f0d6e6342c427cb341ee18a894b146b789","https://git.kernel.org/stable/c/f488116df769bdaf89c93371350e49e12133e70f","https://git.kernel.org/stable/c/8150c48fb978e01689f94ed80148f8a7499ae571","https://git.kernel.org/stable/c/659b9b4f194bb56b9903cc95e786ef1d438baa7d","https://git.kernel.org/stable/c/3b536db8fb32da9e9c62f2bb45e2e319331f0426"],"weaknesses":["CWE-862"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/68xxx/CVE-2026-68294.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68294","state":"PUBLISHED","datePublished":"2026-08-10T12:02:27.423Z","dateUpdated":"2026-10-19T21:09:03.595Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-30T09:28:09.380Z"},"containers":{"cna":{"title":"net: qrtr: restrict socket creation to the initial network namespace","descriptions":[{"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)."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","status":"affected","lessThan":"7814f6a3415cad38aa8d6dfc573df778260d66aa","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","status":"affected","lessThan":"2d22b94a154ccb9755dddfff802fe3e2b1adbab5","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","status":"affected","lessThan":"8d351fe0654a20c9f95a61b05d24ebe6d4be3fbb","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","status":"affected","lessThan":"4b95e1f0d6e6342c427cb341ee18a894b146b789","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","status":"affected","lessThan":"f488116df769bdaf89c93371350e49e12133e70f","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","status":"affected","lessThan":"8150c48fb978e01689f94ed80148f8a7499ae571","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","status":"affected","lessThan":"659b9b4f194bb56b9903cc95e786ef1d438baa7d","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","status":"affected","lessThan":"3b536db8fb32da9e9c62f2bb45e2e319331f0426","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/qrtr/af_qrtr.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.7","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","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/qrtr/af_qrtr.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/7814f6a3415cad38aa8d6dfc573df778260d66aa"},{"url":"https://git.kernel.org/stable/c/2d22b94a154ccb9755dddfff802fe3e2b1adbab5"},{"url":"https://git.kernel.org/stable/c/8d351fe0654a20c9f95a61b05d24ebe6d4be3fbb"},{"url":"https://git.kernel.org/stable/c/4b95e1f0d6e6342c427cb341ee18a894b146b789"},{"url":"https://git.kernel.org/stable/c/f488116df769bdaf89c93371350e49e12133e70f"},{"url":"https://git.kernel.org/stable/c/8150c48fb978e01689f94ed80148f8a7499ae571"},{"url":"https://git.kernel.org/stable/c/659b9b4f194bb56b9903cc95e786ef1d438baa7d"},{"url":"https://git.kernel.org/stable/c/3b536db8fb32da9e9c62f2bb45e2e319331f0426"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","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's 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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-19T16:32:43.629Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.6.148"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-68294","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:46:44.239269Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-862","lang":"en","type":"CWE","description":"CWE-862 Missing Authorization"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T21:09:03.595Z"}}]}}}