CVE-2026-80584 (GCVE-0-2026-80584)

Vulnerability from cvelistv5 – Published: 2026-08-26 14:37 – Updated: 2026-08-26 14:37
VLAI
Title
s390/qeth: validate user buffer length in SNMP and ARP query ioctls
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4a71df50047f0db65ea09b1be155852e81a45eba , < 9d00eeb2d27f4cc817c5e408760226d43f811ec6 (git)
Affected: 4a71df50047f0db65ea09b1be155852e81a45eba , < 46443eaddebd84c51940857b11787229be169dec (git)
Affected: 4a71df50047f0db65ea09b1be155852e81a45eba , < 91935843f9396a9e45253e2c0d4337ca1371754b (git)
Affected: 4a71df50047f0db65ea09b1be155852e81a45eba , < cc423f4105fe145b33e1d7cad34245a798358f73 (git)
Affected: 4a71df50047f0db65ea09b1be155852e81a45eba , < 3083818e67bcd656965797fbac9a3d6c1d44f78a (git)
Affected: 4a71df50047f0db65ea09b1be155852e81a45eba , < a3083647747942ea32faf14560d6397ff3068046 (git)
Affected: 4a71df50047f0db65ea09b1be155852e81a45eba , < 75fb3151513d7d9f77a8f9545418279b119c06b8 (git)
Affected: 4a71df50047f0db65ea09b1be155852e81a45eba , < d141f087b1af656f055d7c5793a3e87817ba0bbe (git)
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Linux Linux Affected: 2.6.26
Unaffected: 0 , < 2.6.26 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (semver)
Unaffected: 6.1.184 , ≤ 6.1.* (semver)
Unaffected: 6.6.153 , ≤ 6.6.* (semver)
Unaffected: 6.12.105 , ≤ 6.12.* (semver)
Unaffected: 6.18.46 , ≤ 6.18.* (semver)
Unaffected: 7.1.10 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-26T14:37:40.302Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/9d00eeb2d27f4cc817c5e408760226d43f811ec6"
        },
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          "url": "https://git.kernel.org/stable/c/46443eaddebd84c51940857b11787229be169dec"
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    "cveId": "CVE-2026-80584",
    "datePublished": "2026-08-26T14:37:40.302Z",
    "dateReserved": "2026-08-26T14:34:25.769Z",
    "dateUpdated": "2026-08-26T14:37:40.302Z",
    "state": "PUBLISHED"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"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\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"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\",\"versions\":[{\"version\":\"2.6.26\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.26\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.266\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.217\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.184\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.153\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.105\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.46\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.10\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.


Detection rules are retrieved from Rulezet.