{"api_version":"1","generated_at":"2026-09-03T12:08:56+00:00","cve":"CVE-2026-80584","urls":{"html":"https://cve.report/CVE-2026-80584","api":"https://cve.report/api/cve/CVE-2026-80584.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80584","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80584"},"summary":{"title":"s390/qeth: validate user buffer length in SNMP and ARP query ioctls","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/qeth: validate user buffer length in SNMP and ARP query ioctls\n\nqeth_snmp_command() and qeth_l3_arp_query() allocate a buffer sized by\na user-supplied length (udata_len) without checking a lower bound, then\nset udata_offset to a fixed non-zero value and pass both to a reply\ncallback. The callback bounds-checks the copy with\n\n        if ((udata_len - udata_offset) < len)\n\nBoth fields are u32, so a udata_len smaller than udata_offset makes the\nsubtraction wrap and the check pass, and the following memcpy() writes\npast the allocation. A udata_len of 0 also yields ZERO_SIZE_PTR from\nkzalloc(), which the existing NULL check does not catch.\n\nReject buffers smaller than udata_offset before allocating, so the\ncallback subtraction can no longer underflow.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-26 15:17:14","updated_at":"2026-08-27 06:17:45"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.4","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.4","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.4,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/a3083647747942ea32faf14560d6397ff3068046","name":"https://git.kernel.org/stable/c/a3083647747942ea32faf14560d6397ff3068046","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/75fb3151513d7d9f77a8f9545418279b119c06b8","name":"https://git.kernel.org/stable/c/75fb3151513d7d9f77a8f9545418279b119c06b8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/91935843f9396a9e45253e2c0d4337ca1371754b","name":"https://git.kernel.org/stable/c/91935843f9396a9e45253e2c0d4337ca1371754b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d141f087b1af656f055d7c5793a3e87817ba0bbe","name":"https://git.kernel.org/stable/c/d141f087b1af656f055d7c5793a3e87817ba0bbe","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cc423f4105fe145b33e1d7cad34245a798358f73","name":"https://git.kernel.org/stable/c/cc423f4105fe145b33e1d7cad34245a798358f73","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3083818e67bcd656965797fbac9a3d6c1d44f78a","name":"https://git.kernel.org/stable/c/3083818e67bcd656965797fbac9a3d6c1d44f78a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9d00eeb2d27f4cc817c5e408760226d43f811ec6","name":"https://git.kernel.org/stable/c/9d00eeb2d27f4cc817c5e408760226d43f811ec6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/46443eaddebd84c51940857b11787229be169dec","name":"https://git.kernel.org/stable/c/46443eaddebd84c51940857b11787229be169dec","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80584","name":"CVE 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the Linux kernel, the following vulnerability has been resolved:\n\ns390/qeth: validate user buffer length in SNMP and ARP query ioctls\n\nqeth_snmp_command() and qeth_l3_arp_query() allocate a buffer sized by\na user-supplied length (udata_len) without checking a lower bound, then\nset udata_offset to a fixed non-zero value and pass both to a reply\ncallback. The callback bounds-checks the copy with\n\n        if ((udata_len - udata_offset) < len)\n\nBoth fields are u32, so a udata_len smaller than udata_offset makes the\nsubtraction wrap and the check pass, and the following memcpy() writes\npast the allocation. A udata_len of 0 also yields ZERO_SIZE_PTR from\nkzalloc(), which the existing NULL check does not catch.\n\nReject buffers smaller than udata_offset before allocating, so the\ncallback subtraction can no longer underflow."}],"metrics":[{"cvssV3_1":{"baseScore":8.4,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - Exploitation requires a local ioctl(2) on a qeth netdev (SIOC_QETH_ADP_SET_SNMP_CONTROL or SIOC_QETH_ARP_QUERY_INFO) via socket()->dev_ioctl()->dev_siocdevprivate(); no remote packet or network protocol handler reaches these code paths.\nAC:L - The attacker fully controls udata_len in the ioctl argument; values below the fixed udata_offset (16 for SNMP, 6 for ARP) deterministically underflow the u32 bounds check and cause memcpy() past the kmalloc allocation without races or uncontrollable memory layout.\nPR:N - On affected kernels before CVE-2026-74467, SIOC_QETH_ADP_SET_SNMP_CONTROL had no CAP_NET_ADMIN gate and dev_ioctl() performs no capability check for SIOCDEVPRIVATE, so any unprivileged local user on an IBM Z/LinuxONE LPAR with a qeth interface can reach the overflow.\nUI:N - Exploitation requires only the attacker opening a socket and issuing the crafted ioctl against a qeth interface; no victim login, mount, or other interactive action is needed on a shared mainframe guest.\nS:U - Impact is kernel heap corruption and crash within the local LPAR/kernel security boundary on IBM Z; this does not cross a VM guest-to-host, container, or IOMMU security boundary.\nC:H - The unchecked memcpy() performs a kernel heap out-of-bounds write past a user-sized kmalloc buffer, corrupting adjacent slab objects; per CNA guidance, memory corruption exploitable for information disclosure warrants High confidentiality impact.\nI:H - Integer underflow bypasses the bounds check and memcpy() writes OSA SNMP/ARP response data past the kmalloc allocation end, providing a kernel heap overflow primitive suitable for adjacent-object corruption and privilege escalation.\nA:H - udata_len=0 yields ZERO_SIZE_PTR from kzalloc() (not caught by the NULL check) and memcpy() writes to a fixed low kernel address causing a CPU fault; undersized non-zero lengths corrupt the heap and can trigger kernel oops or panic."}]}],"providerMetadata":{"dateUpdated":"2026-08-27T05:02:04.879Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/9d00eeb2d27f4cc817c5e408760226d43f811ec6"},{"url":"https://git.kernel.org/stable/c/46443eaddebd84c51940857b11787229be169dec"},{"url":"https://git.kernel.org/stable/c/91935843f9396a9e45253e2c0d4337ca1371754b"},{"url":"https://git.kernel.org/stable/c/cc423f4105fe145b33e1d7cad34245a798358f73"},{"url":"https://git.kernel.org/stable/c/3083818e67bcd656965797fbac9a3d6c1d44f78a"},{"url":"https://git.kernel.org/stable/c/a3083647747942ea32faf14560d6397ff3068046"},{"url":"https://git.kernel.org/stable/c/75fb3151513d7d9f77a8f9545418279b119c06b8"},{"url":"https://git.kernel.org/stable/c/d141f087b1af656f055d7c5793a3e87817ba0bbe"}],"title":"s390/qeth: validate user buffer length in SNMP and ARP query ioctls","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80584","datePublished":"2026-08-26T14:37:40.302Z","dateReserved":"2026-08-26T14:34:25.769Z","dateUpdated":"2026-08-27T05:02:04.879Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-26 15:17:14","lastModifiedDate":"2026-08-27 06:17:45","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.5,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80584","Ordinal":"1","Title":"s390/qeth: validate user buffer length in SNMP and ARP query ioc","CVE":"CVE-2026-80584","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80584","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/qeth: validate user buffer length in SNMP and ARP query ioctls\n\nqeth_snmp_command() and qeth_l3_arp_query() allocate a buffer sized by\na user-supplied length (udata_len) without checking a lower bound, then\nset udata_offset to a fixed non-zero value and pass both to a reply\ncallback. The callback bounds-checks the copy with\n\n        if ((udata_len - udata_offset) < len)\n\nBoth fields are u32, so a udata_len smaller than udata_offset makes the\nsubtraction wrap and the check pass, and the following memcpy() writes\npast the allocation. A udata_len of 0 also yields ZERO_SIZE_PTR from\nkzalloc(), which the existing NULL check does not catch.\n\nReject buffers smaller than udata_offset before allocating, so the\ncallback subtraction can no longer underflow.","Type":"Description","Title":"s390/qeth: validate user buffer length in SNMP and ARP query ioc"}]}}}