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CVE-2026-90038

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: NFSD: Prevent client use-after-free during export state revocation nfsd4_revoke_export_states() has the same use-after-free as…

Published Sep 16, 2026EPSS 0.55%

Overview

CVE-2026-90038 is a critical-severity vulnerability. It was published on September 16, 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:

NFSD: Prevent client use-after-free during export state revocation

nfsd4_revoke_export_states() has the same use-after-free as

nfsd4_revoke_states(): it drops nn->client_lock across

revoke_one_stid() and the following read of clp->cl_minorversion, but

the stateid reference it holds does not pin the client. A teardown

racing the dropped lock can free the client while revoke_one_stid()

still dereferences it.

exportfs -u drives this path through NFSD_CMD_UNLOCK_EXPORT, so an

administrator removing an export can race a client expiry.

Skip a client that is already expiring and otherwise pin it with

cl_rpc_users under client_lock before dropping the lock, matching

nfsd4_revoke_states().

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/2108de53568a64936a0da3e04d85c35df98d3fb6Refgit.kernel.org/stable/c/c05ae58fe06ce2ac34312f649e71c3596bdde358

How CyberStrike helps

Frequently asked questions

What is CVE-2026-90038?

CVE-2026-90038 is a critical-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-90038?

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-2026-90038?

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-2026-90038?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-90038 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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