Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2026-43185

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix signededness bug in smb_direct_prepare_negotiation() smb_direct_prepare_negotiation() casts an unsigned __u32 value…

Published May 6, 2026CWE-674EPSS 0.70%

Overview

CVE-2026-43185 is a critical-severity vulnerability. It was published on May 6, 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:

ksmbd: fix signededness bug in smb_direct_prepare_negotiation()

smb_direct_prepare_negotiation() casts an unsigned __u32 value

from sp->max_recv_size and req->preferred_send_size to a signed

int before computing min_t(int, ...). A maliciously provided

preferred_send_size of 0x80000000 will return as smaller than

max_recv_size, and then be used to set the maximum allowed

alowed receive size for the next message.

By sending a second message with a large value (>1420 bytes)

the attacker can then achieve a heap buffer overflow.

This fix replaces min_t(int, ...) with min_t(u32)

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/55abc475d096da4a5356b6efb0cfdc6156bc1550Refgit.kernel.org/stable/c/6b4f875aac344cdd52a1f34cc70ed2f874a65757Refgit.kernel.org/stable/c/ceae058eb707ddd0d68f0872f9d9f23b7c30c37b

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43185?

CVE-2026-43185 is a critical-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-43185?

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-2026-43185?

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-2026-43185?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43185 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.

Related CRITICAL CVEs from 2026

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999