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CVE-2026-89699

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: nfsd: validate symlink target length in NFSv4 CREATE nfsd4_decode_create() accepts an unbounded cr_datalen from the wire for NF…

Published Sep 11, 2026EPSS 0.50%

Overview

CVE-2026-89699 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. 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:

nfsd: validate symlink target length in NFSv4 CREATE

nfsd4_decode_create() accepts an unbounded cr_datalen from the wire for

NF4LNK symlink targets, allowing a client to force a kmalloc of up to

the maximum RPC payload size (several MiB) per COMPOUND op that persists

until compound teardown. The VFS rejects oversized targets with

ENAMETOOLONG, but the allocation has already occurred.

Reject cr_datalen == 0 early with nfserr_inval and cr_datalen greater

than NFS4_MAXPATHLEN (PATH_MAX) with nfserr_nametoolong to bound the

allocation.

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/041f57056e5fb9c80adc088269322d2c61074406Refgit.kernel.org/stable/c/36011308b3f01ce7dc9954f3cefcbb5291af9f95Refgit.kernel.org/stable/c/3ef5e7a01a4d74995a65496bc9166d1e980a4355Refgit.kernel.org/stable/c/45ec115cbfecb4b3cfab7fca6f73d1b60696a25aRefgit.kernel.org/stable/c/8661d3cb38fd148947e57dbc0871fd4d3fa33bbfRefgit.kernel.org/stable/c/888dad4b557352cf85be31613407b5ba51ad07d1Refgit.kernel.org/stable/c/895a485cd3758031ef9993c0d53cf19ce8fb4cccRefgit.kernel.org/stable/c/b24843ea3de1676b29902457b38507c95a80649b

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89699?

CVE-2026-89699 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-89699?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-89699?

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-2026-89699?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89699 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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