{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68294","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-30T09:28:09.380Z","datePublished":"2026-08-10T12:02:27.423Z","dateUpdated":"2026-08-19T16:32:43.629Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-19T16:32:43.629Z"},"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)."}],"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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/qrtr/af_qrtr.c"],"versions":[{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","lessThan":"7814f6a3415cad38aa8d6dfc573df778260d66aa","status":"affected","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","lessThan":"2d22b94a154ccb9755dddfff802fe3e2b1adbab5","status":"affected","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","lessThan":"8d351fe0654a20c9f95a61b05d24ebe6d4be3fbb","status":"affected","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","lessThan":"4b95e1f0d6e6342c427cb341ee18a894b146b789","status":"affected","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","lessThan":"f488116df769bdaf89c93371350e49e12133e70f","status":"affected","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","lessThan":"8150c48fb978e01689f94ed80148f8a7499ae571","status":"affected","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","lessThan":"659b9b4f194bb56b9903cc95e786ef1d438baa7d","status":"affected","versionType":"git"},{"version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","lessThan":"3b536db8fb32da9e9c62f2bb45e2e319331f0426","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/qrtr/af_qrtr.c"],"versions":[{"version":"4.7","status":"affected"},{"version":"0","lessThan":"4.7","status":"unaffected","versionType":"semver"},{"version":"5.10.265","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.216","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.183","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.148","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.101","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.42","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.6","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":"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"}]}]}],"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"}],"title":"net: qrtr: restrict socket creation to the initial network namespace","x_generator":{"engine":"bippy-1.2.0"}}}}