GHSA-CMJF-X265-CCVJ
Vulnerability from github – Published: 2026-08-27 06:31 – Updated: 2026-08-27 06:31In 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.
{
"affected": [],
"aliases": [
"CVE-2026-80584"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-26T15:17:14Z",
"severity": "HIGH"
},
"details": "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": "GHSA-cmjf-x265-ccvj",
"modified": "2026-08-27T06:31:33Z",
"published": "2026-08-27T06:31:33Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80584"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3083818e67bcd656965797fbac9a3d6c1d44f78a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/46443eaddebd84c51940857b11787229be169dec"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/75fb3151513d7d9f77a8f9545418279b119c06b8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/91935843f9396a9e45253e2c0d4337ca1371754b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9d00eeb2d27f4cc817c5e408760226d43f811ec6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a3083647747942ea32faf14560d6397ff3068046"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cc423f4105fe145b33e1d7cad34245a798358f73"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d141f087b1af656f055d7c5793a3e87817ba0bbe"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.