FKIE_CVE-2026-80584
Vulnerability from fkie_nvd - Published: 2026-08-26 15:17 - Updated: 2026-10-16 20:18
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
s390/qeth: validate user buffer length in SNMP and ARP query ioctls
qeth_snmp_command() and qeth_l3_arp_query() allocate a buffer sized by
a user-supplied length (udata_len) without checking a lower bound, then
set udata_offset to a fixed non-zero value and pass both to a reply
callback. The callback bounds-checks the copy with
if ((udata_len - udata_offset) < len)
Both fields are u32, so a udata_len smaller than udata_offset makes the
subtraction wrap and the check pass, and the following memcpy() writes
past the allocation. A udata_len of 0 also yields ZERO_SIZE_PTR from
kzalloc(), which the existing NULL check does not catch.
Reject buffers smaller than udata_offset before allocating, so the
callback subtraction can no longer underflow.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/s390/net/qeth_core_main.c",
"drivers/s390/net/qeth_l3_main.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "9d00eeb2d27f4cc817c5e408760226d43f811ec6",
"status": "affected",
"version": "4a71df50047f0db65ea09b1be155852e81a45eba",
"versionType": "git"
},
{
"lessThan": "46443eaddebd84c51940857b11787229be169dec",
"status": "affected",
"version": "4a71df50047f0db65ea09b1be155852e81a45eba",
"versionType": "git"
},
{
"lessThan": "91935843f9396a9e45253e2c0d4337ca1371754b",
"status": "affected",
"version": "4a71df50047f0db65ea09b1be155852e81a45eba",
"versionType": "git"
},
{
"lessThan": "cc423f4105fe145b33e1d7cad34245a798358f73",
"status": "affected",
"version": "4a71df50047f0db65ea09b1be155852e81a45eba",
"versionType": "git"
},
{
"lessThan": "3083818e67bcd656965797fbac9a3d6c1d44f78a",
"status": "affected",
"version": "4a71df50047f0db65ea09b1be155852e81a45eba",
"versionType": "git"
},
{
"lessThan": "a3083647747942ea32faf14560d6397ff3068046",
"status": "affected",
"version": "4a71df50047f0db65ea09b1be155852e81a45eba",
"versionType": "git"
},
{
"lessThan": "75fb3151513d7d9f77a8f9545418279b119c06b8",
"status": "affected",
"version": "4a71df50047f0db65ea09b1be155852e81a45eba",
"versionType": "git"
},
{
"lessThan": "d141f087b1af656f055d7c5793a3e87817ba0bbe",
"status": "affected",
"version": "4a71df50047f0db65ea09b1be155852e81a45eba",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/s390/net/qeth_core_main.c",
"drivers/s390/net/qeth_l3_main.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.26"
},
{
"lessThan": "2.6.26",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.266",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.217",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.184",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.153",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.105",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.46",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"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) \u003c 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": "2026-10-16T20:18:01.410",
"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"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-80584",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-16T19:17:53.198738Z",
"version": "2.0.3"
}
}
]
},
"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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Nomenclature
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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