{"apiVersion":"1.0","identifier":"CVE-2026-80584","description":"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.","publishedAt":"2026-08-26T15:17:14","lastModifiedAt":"2026-08-27T06:17:45","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-80584","cvssScore":8.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.00134,"riskScore":0.85,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-80584","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-80584","en":"https://www.redsauce.net/en/cves/CVE-2026-80584","fr":"https://www.redsauce.net/fr/cves/CVE-2026-80584","pt":"https://www.redsauce.net/pt/cves/CVE-2026-80584","de":"https://www.redsauce.net/de/cves/CVE-2026-80584","sk":"https://www.redsauce.net/sk/cves/CVE-2026-80584","el":"https://www.redsauce.net/el/cves/CVE-2026-80584"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-80584"}}