CVE-2026-80584 (GCVE-0-2026-80584)
Vulnerability from cvelistv5
Published
2026-08-26 14:37
Modified
2026-10-16 19:26
Severity ?
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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
Linux Linux Version: 4a71df50047f0db65ea09b1be155852e81a45eba
Version: 4a71df50047f0db65ea09b1be155852e81a45eba
Version: 4a71df50047f0db65ea09b1be155852e81a45eba
Version: 4a71df50047f0db65ea09b1be155852e81a45eba
Version: 4a71df50047f0db65ea09b1be155852e81a45eba
Version: 4a71df50047f0db65ea09b1be155852e81a45eba
Version: 4a71df50047f0db65ea09b1be155852e81a45eba
Version: 4a71df50047f0db65ea09b1be155852e81a45eba
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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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.266\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.217\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.184\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.153\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.105\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.46\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.10\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"2.6.26\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-27T05:02:04.879Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-80584\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T19:26:28.329Z\", \"dateReserved\": \"2026-08-26T14:34:25.769Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-26T14:37:40.302Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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