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CVE-2026-43112

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath When cifs_sanitize_prepath is called with an empty string or a s…

Published May 6, 2026CWE-125EPSS 0.35%

Overview

CVE-2026-43112 is a high-severity vulnerability. It was published on May 6, 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. No authentication or special privileges are required for exploitation.

Technical description

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

fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath

When cifs_sanitize_prepath is called with an empty string or a string

containing only delimiters (e.g., "/"), the current logic attempts to

check *(cursor2 - 1) before cursor2 has advanced. This results in an

out-of-bounds read.

This patch adds an early exit check after stripping prepended

delimiters. If no path content remains, the function returns NULL.

The bug was identified via manual audit and verified using a

standalone test case compiled with AddressSanitizer, which

triggered a SEGV on affected inputs.

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/2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439Refgit.kernel.org/stable/c/49b1ce6d7cfb6c5a49f68bf5ccfcfb6ba14e63c3Refgit.kernel.org/stable/c/5d4fe469fe7dbff7d874c196bb680a82f2625d95Refgit.kernel.org/stable/c/78ec5bf2f589ec7fd8f169394bfeca541b077317Refgit.kernel.org/stable/c/86f9c23e0814cfdffda9eedf0c591c51ba209010Refgit.kernel.org/stable/c/a2ba20c17de8eb028f96b1d85f119d3d25655bd9Refgit.kernel.org/stable/c/fbced33599653471b4581dfe1abc7b467031f126Refaccess.redhat.com/errata/RHSA-2026:34911Refaccess.redhat.com/errata/RHSA-2026:36018Refaccess.redhat.com/errata/RHSA-2026:36365

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43112?

CVE-2026-43112 is a high-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-43112?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-43112?

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-2026-43112?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43112 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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