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CVE-2026-45983

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: nfsd: never defer requests during idmap lookup During v4 request compound arg decoding, some ops (e.g.

Published May 27, 2026EPSS 0.16%

Overview

CVE-2026-45983 is a medium-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

nfsd: never defer requests during idmap lookup

During v4 request compound arg decoding, some ops (e.g. SETATTR)

can trigger idmap lookup upcalls. When those upcall responses get

delayed beyond the allowed time limit, cache_check() will mark the

request for deferral and cause it to be dropped.

This prevents nfs4svc_encode_compoundres from being executed, and

thus the session slot flag NFSD4_SLOT_INUSE never gets cleared.

Subsequent client requests will fail with NFSERR_JUKEBOX, given

that the slot will be marked as in-use, making the SEQUENCE op

fail.

Fix this by making sure that the RQ_USEDEFERRAL flag is always

clear during nfs4svc_decode_compoundargs(), since no v4 request

should ever be deferred.

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/063a6f22478ef929625000a2caf54667725c1dfdRefgit.kernel.org/stable/c/243f71ed873ff3feeb6f9b5cb145d63f7188b4c4Refgit.kernel.org/stable/c/3a72c7dedc99b321e0f267e4e999e5baf07c4593Refgit.kernel.org/stable/c/8dff54fe88c0dcd4c55bff9fc2fa6ca968290826Refgit.kernel.org/stable/c/99e17b20fddac19a228d213e00f6b9e1c10daff9Refgit.kernel.org/stable/c/b9abb760db20504240a7147f27934d900cd80b23Refgit.kernel.org/stable/c/d75ec4504a4340b033b15cad0303988b3089dd93Refgit.kernel.org/stable/c/f9c206cdc4266caad6a9a7f46341420a10f03ccb

How CyberStrike helps

Frequently asked questions

What is CVE-2026-45983?

CVE-2026-45983 is a medium-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-45983?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-45983?

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-2026-45983?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-45983 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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