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CVE-2026-80584

8.4 · HIGH

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 buff…

Published Aug 26, 2026EPSS 0.20%

Overview

CVE-2026-80584 is a high-severity vulnerability. It was published on August 26, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/3083818e67bcd656965797fbac9a3d6c1d44f78aRefgit.kernel.org/stable/c/46443eaddebd84c51940857b11787229be169decRefgit.kernel.org/stable/c/75fb3151513d7d9f77a8f9545418279b119c06b8Refgit.kernel.org/stable/c/91935843f9396a9e45253e2c0d4337ca1371754bRefgit.kernel.org/stable/c/9d00eeb2d27f4cc817c5e408760226d43f811ec6Refgit.kernel.org/stable/c/a3083647747942ea32faf14560d6397ff3068046Refgit.kernel.org/stable/c/cc423f4105fe145b33e1d7cad34245a798358f73Refgit.kernel.org/stable/c/d141f087b1af656f055d7c5793a3e87817ba0bbe

How CyberStrike helps

Frequently asked questions

What is CVE-2026-80584?

CVE-2026-80584 is a high-severity vulnerability. It was published on August 26, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

How severe is CVE-2026-80584?

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-80584?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-80584?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-80584 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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