{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80584", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.769Z", "datePublished": "2026-08-26T14:37:40.302Z", "dateUpdated": "2026-08-27T05:02:04.879Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-27T05:02:04.879Z"}, "descriptions": [{"lang": "en", "value": "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."}], "metrics": [{"cvssV3_1": {"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"}, "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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/s390/net/qeth_core_main.c", "drivers/s390/net/qeth_l3_main.c"], "versions": [{"version": "4a71df50047f0db65ea09b1be155852e81a45eba", "lessThan": "9d00eeb2d27f4cc817c5e408760226d43f811ec6", "status": "affected", "versionType": "git"}, {"version": "4a71df50047f0db65ea09b1be155852e81a45eba", "lessThan": "46443eaddebd84c51940857b11787229be169dec", "status": "affected", "versionType": "git"}, {"version": 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"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": "2.6.26", "versionEndExcluding": "5.10.266"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "5.15.217"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.1.184"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.6.153"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.12.105"}, {"vulnerable": true, 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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."}], "id": "CVE-2026-80584", "lastModified": "2026-08-27T06:17:45.070", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-26T15:17:14.577", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3083818e67bcd656965797fbac9a3d6c1d44f78a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/46443eaddebd84c51940857b11787229be169dec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/75fb3151513d7d9f77a8f9545418279b119c06b8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/91935843f9396a9e45253e2c0d4337ca1371754b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9d00eeb2d27f4cc817c5e408760226d43f811ec6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a3083647747942ea32faf14560d6397ff3068046"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cc423f4105fe145b33e1d7cad34245a798358f73"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d141f087b1af656f055d7c5793a3e87817ba0bbe"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

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