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CVE-2026-31704

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ksmbd: use check_add_overflow() to prevent u16 DACL size overflow set_posix_acl_entries_dacl() and set_ntacl_dacl() accumulate…

Published May 1, 2026EPSS 0.16%

Overview

CVE-2026-31704 is a medium-severity vulnerability. It was published on May 1, 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:

ksmbd: use check_add_overflow() to prevent u16 DACL size overflow

set_posix_acl_entries_dacl() and set_ntacl_dacl() accumulate ACE sizes

in u16 variables. When a file has many POSIX ACL entries, the

accumulated size can wrap past 65535, causing the pointer arithmetic

(char *)pndace + *size to land within already-written ACEs. Subsequent

writes then overwrite earlier entries, and pndacl->size gets a

truncated value.

Use check_add_overflow() at each accumulation point to detect the

wrap before it corrupts the buffer, consistent with existing

check_mul_overflow() usage elsewhere in smbacl.c.

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/299f962c0b02d048fb45d248b4da493d03f3175dRefgit.kernel.org/stable/c/41e53a773db6342ac9a689ee5ba635c31744c9f0Refgit.kernel.org/stable/c/5e7b8f3c539d69b2ed5f2408e2f75e68ce7eef43Refgit.kernel.org/stable/c/8d5729350b236896f51379588d9a690b7fafb8dbRefgit.kernel.org/stable/c/e1955a94b6f17f4b058afa955a6f187eb3ed7615Refgit.kernel.org/stable/c/ef7902be3f215b6bf7babe4dc9dd9a7d57dad7a7

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31704?

CVE-2026-31704 is a medium-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-31704?

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-2026-31704?

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-2026-31704?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31704 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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