{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "4a71df50047f0db65ea09b1be155852e81a45eba"
            },
            {
              "fixed": "9d00eeb2d27f4cc817c5e408760226d43f811ec6"
            },
            {
              "fixed": "46443eaddebd84c51940857b11787229be169dec"
            },
            {
              "fixed": "91935843f9396a9e45253e2c0d4337ca1371754b"
            },
            {
              "fixed": "cc423f4105fe145b33e1d7cad34245a798358f73"
            },
            {
              "fixed": "3083818e67bcd656965797fbac9a3d6c1d44f78a"
            },
            {
              "fixed": "a3083647747942ea32faf14560d6397ff3068046"
            },
            {
              "fixed": "75fb3151513d7d9f77a8f9545418279b119c06b8"
            },
            {
              "fixed": "d141f087b1af656f055d7c5793a3e87817ba0bbe"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.26"
            },
            {
              "fixed": "5.10.266"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.217"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.184"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.153"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.105"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.46"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80584.json"
  },
  "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": "CVE-2026-80584",
  "modified": "2026-08-28T03:30:22.274871504Z",
  "published": "2026-08-26T14:37:40.302Z",
  "references": [
    {
      "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"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80584.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80584"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "s390/qeth: validate user buffer length in SNMP and ARP query ioctls"
}