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CVE-2026-72310

8.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix overflow in passthrough ioctl bounds check smb2_ioctl_query_info() validates the PASSTHRU_FSCTL response paylo…

Published Aug 15, 2026EPSS 0.64%

Overview

CVE-2026-72310 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, 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:

smb: client: fix overflow in passthrough ioctl bounds check

smb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload

before copying it to userspace.

The payload offset and length both come from 32-bit fields. The bounds

check currently adds OutputOffset and qi.input_buffer_length directly, so

the addition can wrap in 32-bit arithmetic before the result is compared

against the response buffer length.

A malicious server can use a large OutputOffset and a small OutputCount

to make the wrapped sum pass the bounds check. The later copy_to_user()

then reads from io_rsp + OutputOffset, outside the response buffer.

Use size_add() for the offset plus length check so overflow is treated as

out of bounds.

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/160045fc943f6c46b227644261252c8a22b8a87aRefgit.kernel.org/stable/c/1627e7d5c9b09721a141d07cedb178882f1ded67Refgit.kernel.org/stable/c/175357ee0c596cb82054650dfa32fda51ad35aaaRefgit.kernel.org/stable/c/1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9Refgit.kernel.org/stable/c/63feb687e89a3a52a31e6e01764117cc500f1974Refgit.kernel.org/stable/c/a4f27ad055392fa164f5649e89a3637b033c5fccRefgit.kernel.org/stable/c/b30771b69eafae750afb7385fbcc3d77ed3f3670Refgit.kernel.org/stable/c/dbd126539c098dba3159ce7d34b10b2daddcbd0f

How CyberStrike helps

Frequently asked questions

What is CVE-2026-72310?

CVE-2026-72310 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-72310?

This vulnerability has a CVSS 3.1 base score of 8.1, 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-2026-72310?

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-2026-72310?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-72310 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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