{"id":"CVE-2026-74467","state":"PUBLISHED","title":"s390/qeth: Check CAP_NET_ADMIN for private ioctls","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/qeth: Check CAP_NET_ADMIN for private ioctls\n\nGate the SIOCDEVPRIVATE ioctl commands SIOC_QETH_ADP_SET_SNMP_CONTROL,\nSIOC_QETH_GET_CARD_TYPE and SIOC_QETH_QUERY_OAT with CAP_NET_ADMIN\ncapable check to ensure unprivileged users cannot invoke them.","publishedAt":"2026-08-15T12:27:05.635Z","updatedAt":"2026-10-16T19:05:47.339Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"18787eeebd7129ecf4960876d24f349682207783","status":"affected","lessThan":"8fb69547924bbb3d7c900a0d7d137a7234db3f5f","versionType":"git"},{"version":"18787eeebd7129ecf4960876d24f349682207783","status":"affected","lessThan":"3ea5210db058347481c93849786982f874f7be2d","versionType":"git"},{"version":"18787eeebd7129ecf4960876d24f349682207783","status":"affected","lessThan":"4e48168825818bf4a13c743582227d15f1d30d04","versionType":"git"},{"version":"18787eeebd7129ecf4960876d24f349682207783","status":"affected","lessThan":"b40c74262f7e1e601221cebccdbdb2b392ff9976","versionType":"git"},{"version":"18787eeebd7129ecf4960876d24f349682207783","status":"affected","lessThan":"bd63c7879eaa87f1958f7ee027813356fcd9ff11","versionType":"git"},{"version":"18787eeebd7129ecf4960876d24f349682207783","status":"affected","lessThan":"93a0a846ec59a88e0c402878a15357a5ce430eb4","versionType":"git"},{"version":"18787eeebd7129ecf4960876d24f349682207783","status":"affected","lessThan":"d211028bac1bd0fff0026bfa2a8328e5b78cd0e6","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/s390/net/qeth_core_main.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","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":"6.6.151","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","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":["drivers/s390/net/qeth_core_main.c"]}],"references":["https://git.kernel.org/stable/c/8fb69547924bbb3d7c900a0d7d137a7234db3f5f","https://git.kernel.org/stable/c/3ea5210db058347481c93849786982f874f7be2d","https://git.kernel.org/stable/c/4e48168825818bf4a13c743582227d15f1d30d04","https://git.kernel.org/stable/c/b40c74262f7e1e601221cebccdbdb2b392ff9976","https://git.kernel.org/stable/c/bd63c7879eaa87f1958f7ee027813356fcd9ff11","https://git.kernel.org/stable/c/93a0a846ec59a88e0c402878a15357a5ce430eb4","https://git.kernel.org/stable/c/d211028bac1bd0fff0026bfa2a8328e5b78cd0e6"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74467.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74467","state":"PUBLISHED","datePublished":"2026-08-15T12:27:05.635Z","dateUpdated":"2026-10-16T19:05:47.339Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.902Z"},"containers":{"cna":{"title":"s390/qeth: Check CAP_NET_ADMIN for private ioctls","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/qeth: Check CAP_NET_ADMIN for private ioctls\n\nGate the SIOCDEVPRIVATE ioctl commands SIOC_QETH_ADP_SET_SNMP_CONTROL,\nSIOC_QETH_GET_CARD_TYPE and SIOC_QETH_QUERY_OAT with CAP_NET_ADMIN\ncapable check to ensure unprivileged users cannot invoke them."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"18787eeebd7129ecf4960876d24f349682207783","status":"affected","lessThan":"8fb69547924bbb3d7c900a0d7d137a7234db3f5f","versionType":"git"},{"version":"18787eeebd7129ecf4960876d24f349682207783","status":"affected","lessThan":"3ea5210db058347481c93849786982f874f7be2d","versionType":"git"},{"version":"18787eeebd7129ecf4960876d24f349682207783","status":"affected","lessThan":"4e48168825818bf4a13c743582227d15f1d30d04","versionType":"git"},{"version":"18787eeebd7129ecf4960876d24f349682207783","status":"affected","lessThan":"b40c74262f7e1e601221cebccdbdb2b392ff9976","versionType":"git"},{"version":"18787eeebd7129ecf4960876d24f349682207783","status":"affected","lessThan":"bd63c7879eaa87f1958f7ee027813356fcd9ff11","versionType":"git"},{"version":"18787eeebd7129ecf4960876d24f349682207783","status":"affected","lessThan":"93a0a846ec59a88e0c402878a15357a5ce430eb4","versionType":"git"},{"version":"18787eeebd7129ecf4960876d24f349682207783","status":"affected","lessThan":"d211028bac1bd0fff0026bfa2a8328e5b78cd0e6","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/s390/net/qeth_core_main.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","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":"6.6.151","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","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":["drivers/s390/net/qeth_core_main.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/8fb69547924bbb3d7c900a0d7d137a7234db3f5f"},{"url":"https://git.kernel.org/stable/c/3ea5210db058347481c93849786982f874f7be2d"},{"url":"https://git.kernel.org/stable/c/4e48168825818bf4a13c743582227d15f1d30d04"},{"url":"https://git.kernel.org/stable/c/b40c74262f7e1e601221cebccdbdb2b392ff9976"},{"url":"https://git.kernel.org/stable/c/bd63c7879eaa87f1958f7ee027813356fcd9ff11"},{"url":"https://git.kernel.org/stable/c/93a0a846ec59a88e0c402878a15357a5ce430eb4"},{"url":"https://git.kernel.org/stable/c/d211028bac1bd0fff0026bfa2a8328e5b78cd0e6"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - Exploitation requires a local ioctl(2) on a qeth network interface via socket(SIOCDEVPRIVATE+5..+7); the path is sock_ioctl() -> dev_ioctl() -> dev_siocdevprivate() -> qeth_siocdevprivate() with no remote packet or network protocol entry point.\nAC:L - Any local user who can open an AF_INET socket and name a qeth netdev can invoke these ioctls deterministically; no races, special memory layout, or rare kernel configuration is required beyond s390 hardware with qeth present.\nPR:L - The bug is missing CAP_NET_ADMIN in qeth_siocdevprivate(); generic SIOCDEVPRIVATE handling in dev_ioctl() performs no capability check, so any unprivileged local account on an IBM Z/LinuxONE LPAR can reach these handlers without root or namespace-granted admin rights.\nUI:N - Exploitation needs only the attacker opening a socket and issuing ioctl against a qeth interface; no victim login, mount, or other interactive action is required on a shared mainframe guest.\nS:U - Impact stays within kernel/driver control of the local OSA/QDIO adapter and does not cross a VM, container, or IOMMU security boundary; this is standard local privilege and hardware-management misuse, not a guest-to-host escape.\nC:H - SIOC_QETH_QUERY_OAT and SIOC_QETH_ADP_SET_SNMP_CONTROL copy OSA Express firmware response buffers (link attributes, adapter operational data, SNMP MIB objects, card-type details) to unprivileged userspace, disclosing network hardware management information normally restricted to administrators.\nI:H - SIOC_QETH_ADP_SET_SNMP_CONTROL accepts attacker-controlled qeth_snmp_cmd request/data and forwards IPA_SETADP_SET_SNMP_CONTROL commands to OSA firmware, letting unprivileged users alter adapter SNMP/management state on production IBM Z network interfaces.\nA:H - Handlers honor attacker-chosen buffer sizes (kzalloc(udata_len) in qeth_snmp_command and vzalloc(buffer_len) in qeth_query_oat_command without upper bounds), enabling repeated large allocations for kernel memory exhaustion/OOM, and malformed IPA commands can disrupt adapter 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