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CVE-2026-31694

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: fuse: reject oversized dirents in page cache fuse_add_dirent_to_cache() computes a serialized dirent size from the server-contr…

Published May 1, 2026EPSS 0.18%

Overview

CVE-2026-31694 is a high-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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:

fuse: reject oversized dirents in page cache

fuse_add_dirent_to_cache() computes a serialized dirent size from the

server-controlled namelen field and copies the dirent into a single

page-cache page. The existing logic only checks whether the dirent fits

in the remaining space of the current page and advances to a fresh page

if not. It never checks whether the dirent itself exceeds PAGE_SIZE.

As a result, a malicious FUSE server can return a dirent with

namelen=4095, producing a serialized record size of 4120 bytes. On 4 KiB

page systems this causes memcpy() to overflow the cache page by 24 bytes

into the following kernel page.

Reject dirents that cannot fit in a single page before copying them into

the readdir cache.

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/474ce83c96a55f2eeb14dee2be375eeadfdacdf5Refgit.kernel.org/stable/c/51a8de6c50bf947c8f534cd73da4c8f0a13e7bedRefgit.kernel.org/stable/c/7de93abfaae1b2dc94da8a07a36421bd073f1d8f

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31694?

CVE-2026-31694 is a high-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-31694?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-31694?

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-2026-31694?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31694 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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