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CVE-2026-63800

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: pNFS: Fix use-after-free in pnfs_update_layout() When hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(), the code ca…

Published Jul 19, 2026CWE-416EPSS 0.53%

Overview

CVE-2026-63800 is a critical-severity vulnerability. It was published on July 19, 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:

pNFS: Fix use-after-free in pnfs_update_layout()

When hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(),

the code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds,

pnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(),

which still references 'lo'. This results in a use-after-free when the

tracepoint accesses lo's fields.

Fix this by moving the tracepoint call before pnfs_put_layout_hdr(lo).

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/13e198a90ca4050f4bee8a3f23680389a6563cccRefgit.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2Refgit.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dcRefgit.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889Refgit.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98Refgit.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1Refgit.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4Refgit.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63800?

CVE-2026-63800 is a critical-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-63800?

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-2026-63800?

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-2026-63800?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63800 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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