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CVE-2026-98027

7.0 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: dsa: mv88e6xxx: bound the policy rule dump by the caller's buffer size mv88e6xxx_get_rxnfc() uses rxnfc->rule_cnt as the w…

Published Sep 25, 2026EPSS 0.12%

Overview

CVE-2026-98027 is a high-severity vulnerability. It was published on September 25, 2026 and has a CVSS 3.1 base score of 7.0 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

net: dsa: mv88e6xxx: bound the policy rule dump by the caller's buffer size

mv88e6xxx_get_rxnfc() uses rxnfc->rule_cnt as the write index while

dumping the policy IDR, clobbering the input value before it has been

looked at. That input is the number of entries the caller had room for.

ETHTOOL_GRXCLSRLALL requires no CAP_NET_ADMIN and the ioctl sizes the

buffer from the rule_cnt userspace passes in, so once an admin has

installed policy rules any user can ask for fewer slots than there are

rules and run off the end of the allocation. A rule_cnt of 0 leaves the

buffer pointer NULL and the walk dereferences it.

Count into a local so the caller's limit survives the walk, and stop with

-EMSGSIZE once it is reached.

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/01124cd2cf4b71755b1130ac82d78dcfbd5d69e3Refgit.kernel.org/stable/c/44cd4674d9aa5bdf793b8a8b481c9e8536ed6070Refgit.kernel.org/stable/c/609c4378f212cf580aae02250f1146caf63d873fRefgit.kernel.org/stable/c/7a683c2b062810bca203e41866389daf387c235bRefgit.kernel.org/stable/c/7e4bfc5f0b66feb22cba821303fc25ca22cd0887Refgit.kernel.org/stable/c/b1fffc273112e7284c5b705e186b43b5770cd3d5Refgit.kernel.org/stable/c/c5b5c52b6524c9fb50def2260baac745c095ec3aRefgit.kernel.org/stable/c/cda5ac8fe8ac8e80b1703ebb8c4250726fc19739

How CyberStrike helps

Frequently asked questions

What is CVE-2026-98027?

CVE-2026-98027 is a high-severity vulnerability. It was published on September 25, 2026 and has a CVSS 3.1 base score of 7.0 (HIGH).

How severe is CVE-2026-98027?

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-98027?

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-2026-98027?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-98027 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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