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CVE-2026-31464

8.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done() A malicious or compromised VIO server can return a num_written v…

Published Apr 22, 2026CWE-125EPSS 0.42%

Overview

CVE-2026-31464 is a high-severity vulnerability. It was published on April 22, 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 requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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

scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()

A malicious or compromised VIO server can return a num_written value in the

discover targets MAD response that exceeds max_targets. This value is

stored directly in vhost->num_targets without validation, and is then used

as the loop bound in ibmvfc_alloc_targets() to index into disc_buf[], which

is only allocated for max_targets entries. Indices at or beyond max_targets

access kernel memory outside the DMA-coherent allocation. The

out-of-bounds data is subsequently embedded in Implicit Logout and PLOGI

MADs that are sent back to the VIO server, leaking kernel memory.

Fix by clamping num_written to max_targets before storing it.

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/394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89Refgit.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161Refgit.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362fRefgit.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983Refgit.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402ccRefgit.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139dbRefgit.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780Refgit.kernel.org/stable/c/d842348f8a00d5b1d7358f207eb34ffcf5b16df3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31464?

CVE-2026-31464 is a high-severity vulnerability. It was published on April 22, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-31464?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-31464?

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-2026-31464?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31464 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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