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s390/qeth: validate user buffer length in SNMP and ARP query ioctls

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-80584

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-80584

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4a71df50047f0db65ea09b1be155852e81a45eba",
        "lessThan": "9d00eeb2d27f4cc817c5e408760226d43f811ec6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4a71df50047f0db65ea09b1be155852e81a45eba",
        "lessThan": "46443eaddebd84c51940857b11787229be169dec",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4a71df50047f0db65ea09b1be155852e81a45eba",
        "lessThan": "91935843f9396a9e45253e2c0d4337ca1371754b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4a71df50047f0db65ea09b1be155852e81a45eba",
        "lessThan": "cc423f4105fe145b33e1d7cad34245a798358f73",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4a71df50047f0db65ea09b1be155852e81a45eba",
        "lessThan": "3083818e67bcd656965797fbac9a3d6c1d44f78a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4a71df50047f0db65ea09b1be155852e81a45eba",
        "lessThan": "a3083647747942ea32faf14560d6397ff3068046",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4a71df50047f0db65ea09b1be155852e81a45eba",
        "lessThan": "75fb3151513d7d9f77a8f9545418279b119c06b8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4a71df50047f0db65ea09b1be155852e81a45eba",
        "lessThan": "d141f087b1af656f055d7c5793a3e87817ba0bbe",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/s390/net/qeth_core_main.c",
      "drivers/s390/net/qeth_l3_main.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.26"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.26",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.266",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.217",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.184",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.153",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.105",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.46",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.10",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/s390/net/qeth_core_main.c",
      "drivers/s390/net/qeth_l3_main.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-80584

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#34332 · Revision 1
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Publisher date
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