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CVE-2026-98030

7.0 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: dsa: bcm_sf2: bound the CFP rule dump by the caller's buffer size bcm_sf2_cfp_rule_get_all() walks the whole cfp.unique bi…

Published Sep 25, 2026EPSS 0.12%

Overview

CVE-2026-98030 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: bcm_sf2: bound the CFP rule dump by the caller's buffer size

bcm_sf2_cfp_rule_get_all() walks the whole cfp.unique bitmap into

rule_locs[] without consulting nfc->rule_cnt, which is how many 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 CFP 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.

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/8e41ce02589c92356bfd8ef62f6ceff840546e1aRefgit.kernel.org/stable/c/b231b6d8516d3fe0d4bba549908e08d26a4531a5Refgit.kernel.org/stable/c/ca49c526291d7cd3a5cb49b0edd7f50a5ae7176eRefgit.kernel.org/stable/c/cdb719f4b8596d9ccee2d56d204c2c4dce982f46Refgit.kernel.org/stable/c/f1a2869b3629c0e8394b77b38cb9f19a018c653cRefgit.kernel.org/stable/c/f2cf4ef2d94fc15fd2e21c131fc1ab3f76125bf4Refgit.kernel.org/stable/c/f5e93162b3dd195bfda815e8f7a39aaf1d45437bRefgit.kernel.org/stable/c/fd1a78c16b1f6978c09cf048e15f349732e4c707

How CyberStrike helps

Frequently asked questions

What is CVE-2026-98030?

CVE-2026-98030 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-2026-98030?

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-2026-98030?

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-2026-98030?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-98030 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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