CVE-2026-80584High· 8.4▾ TwilightIn 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 (udat…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 46.2 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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.
Linux >= 4a71df50047f0db65ea09b1be155852e81a45eba < 9d00eeb2d27f4cc817c5e408760226d43f811ec6Linux >= 4a71df50047f0db65ea09b1be155852e81a45eba < 46443eaddebd84c51940857b11787229be169decLinux >= 4a71df50047f0db65ea09b1be155852e81a45eba < 91935843f9396a9e45253e2c0d4337ca1371754bLinux >= 4a71df50047f0db65ea09b1be155852e81a45eba < cc423f4105fe145b33e1d7cad34245a798358f73Linux >= 4a71df50047f0db65ea09b1be155852e81a45eba < 3083818e67bcd656965797fbac9a3d6c1d44f78aLinux >= 4a71df50047f0db65ea09b1be155852e81a45eba < a3083647747942ea32faf14560d6397ff3068046Linux >= 4a71df50047f0db65ea09b1be155852e81a45eba < 75fb3151513d7d9f77a8f9545418279b119c06b8Linux >= 4a71df50047f0db65ea09b1be155852e81a45eba < d141f087b1af656f055d7c5793a3e87817ba0bbeLinux 2.6.26Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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