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CVE-2026-53026

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: NFSD: fix nfs4_file access extra count in nfsd4_add_rdaccess_to_wrdeleg In nfsd4_add_rdaccess_to_wrdeleg, if fp->fi_fds[O_RDONL…

Published Jun 24, 2026EPSS 0.43%

Overview

CVE-2026-53026 is a high-severity vulnerability. It was published on June 24, 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: fix nfs4_file access extra count in nfsd4_add_rdaccess_to_wrdeleg

In nfsd4_add_rdaccess_to_wrdeleg, if fp->fi_fds[O_RDONLY] is already

set by another thread, __nfs4_file_get_access should not be called

to increment the nfs4_file access count since that was already done

by the thread that added READ access to the file. The extra fi_access

count in nfs4_file can prevent the corresponding nfsd_file from being

freed.

When stopping nfs-server service, these extra access counts trigger a

BUG in kmem_cache_destroy() that shows nfsd_file object remaining on

__kmem_cache_shutdown.

This problem can be reproduced by running the Git project's test

suite over NFS.

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/4584229395d0d65bd517780afe97ffea07cb2c3dRefgit.kernel.org/stable/c/b48f44f36e6607b2f818560f19deb86b4a9c717bRefgit.kernel.org/stable/c/b81572b073441dfd32213e41857676d0dbff4665

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53026?

CVE-2026-53026 is a high-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-53026?

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-2026-53026?

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-2026-53026?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53026 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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