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vuln-cve/data/2026/80xxx/CVE-2026-80584.json
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{
"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": "2026-10-16T19:26:28.329Z"
},
"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": "4a71df50047f0db65ea09b1be155852e81a45eba",
"lessThan": "91935843f9396a9e45253e2c0d4337ca1371754b",
"status": "affected",
"versionType": "git"
},
{
"version": "4a71df50047f0db65ea09b1be155852e81a45eba",
"lessThan": "cc423f4105fe145b33e1d7cad34245a798358f73",
"status": "affected",
"versionType": "git"
},
{
"version": "4a71df50047f0db65ea09b1be155852e81a45eba",
"lessThan": "3083818e67bcd656965797fbac9a3d6c1d44f78a",
"status": "affected",
"versionType": "git"
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{
"version": "4a71df50047f0db65ea09b1be155852e81a45eba",
"lessThan": "a3083647747942ea32faf14560d6397ff3068046",
"status": "affected",
"versionType": "git"
},
{
"version": "4a71df50047f0db65ea09b1be155852e81a45eba",
"lessThan": "75fb3151513d7d9f77a8f9545418279b119c06b8",
"status": "affected",
"versionType": "git"
},
{
"version": "4a71df50047f0db65ea09b1be155852e81a45eba",
"lessThan": "d141f087b1af656f055d7c5793a3e87817ba0bbe",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"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": "2.6.26",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.26",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.266",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.217",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.184",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.153",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.105",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.46",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.1.10",
"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": "2.6.26",
"versionEndExcluding": "5.10.266"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.26",
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},
{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
"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,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.26",
"versionEndExcluding": "6.18.46"
},
{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.26",
"versionEndExcluding": "7.1.10"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.26",
"versionEndExcluding": "7.2"
}
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]
}
],
"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"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2026-80584",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"version": "2.0.3",
"timestamp": "2026-10-16T19:17:53.198738Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-10-16T19:26:28.329Z"
}
}
]
}
}
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