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CVE-2026-98323

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: Bound fragmented header copies by the remaining length siw_get_hdr() can receive an extended DDP/RDMAP header across…

Published Oct 6, 2026EPSS 0.51%

Overview

CVE-2026-98323 is a critical-severity vulnerability. It was published on October 6, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

RDMA/siw: Bound fragmented header copies by the remaining length

siw_get_hdr() can receive an extended DDP/RDMAP header across more than

one TCP callback. The first callback may receive most of the header,

while the next one still limits the copy to hdrlen - MIN_DDP_HDR instead

of the number of missing bytes. This makes the destination move past the

end of the header and overwrite the receive state, including

fpdu_part_rcvd. A later callback can then use a negative fpdu_part_rcvd

value as a copy offset, which creates an OOB write.

Use the number of header bytes already received when calculating the

next copy length.

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/262dcd809723723ed8a4e05437ec7e9c21a8f17eRefgit.kernel.org/stable/c/2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7Refgit.kernel.org/stable/c/8628f8ebf41669302513fb3f0bf0eba38b226742Refgit.kernel.org/stable/c/9ff797e516dbc1ecb73701ec4c24055712d44411Refgit.kernel.org/stable/c/af9f5b474a260ad23ffb9793d716a5e3bbce3b48Refgit.kernel.org/stable/c/b72dcfb9bf1f0f0147cda03dc59e4002a315067fRefgit.kernel.org/stable/c/e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9dRefgit.kernel.org/stable/c/eb4d7a946970469b3ab0c762432bf161d5b0836c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-98323?

CVE-2026-98323 is a critical-severity vulnerability. It was published on October 6, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-98323?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-98323?

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-2026-98323?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-98323 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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