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CVE-2026-31432

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix OOB write in QUERY_INFO for compound requests When a compound request such as READ + QUERY_INFO(Security) is receive…

Published Apr 22, 2026CWE-787EPSS 0.60%

Overview

CVE-2026-31432 is a high-severity vulnerability. It was published on April 22, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix OOB write in QUERY_INFO for compound requests

When a compound request such as READ + QUERY_INFO(Security) is received,

and the first command (READ) consumes most of the response buffer,

ksmbd could write beyond the allocated buffer while building a security

descriptor.

The root cause was that smb2_get_info_sec() checked buffer space using

ppntsd_size from xattr, while build_sec_desc() often synthesized a

significantly larger descriptor from POSIX ACLs.

This patch introduces smb_acl_sec_desc_scratch_len() to accurately

compute the final descriptor size beforehand, performs proper buffer

checking with smb2_calc_max_out_buf_len(), and uses exact-sized

allocation + iov pinning.

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/075ea208c648cc2bcd616295b711d3637c61de45Refgit.kernel.org/stable/c/515c2daab46021221bdf406bef19bc90a44ec617Refgit.kernel.org/stable/c/850452af77f55d185f9445e1f7a1db53c5e4aad4Refgit.kernel.org/stable/c/d48c64fb80ad78b3dd29fb7d79b6ec7bd72bfc09Refgit.kernel.org/stable/c/fda9522ed6afaec45cabc198d8492270c394c7bc

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31432?

CVE-2026-31432 is a high-severity vulnerability. It was published on April 22, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-31432?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-31432?

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-2026-31432?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31432 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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