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CVE-2026-97990

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: vdpa_sim_net: check TX pull result before RX copy vringh_iov_pull_iotlb() returns a signed byte count.

Published Sep 25, 2026EPSS 0.12%

Overview

CVE-2026-97990 is a high-severity vulnerability. It was published on September 25, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

vdpa_sim_net: check TX pull result before RX copy

vringh_iov_pull_iotlb() returns a signed byte count. A failed TX pull is

currently added to the unsigned byte counter and then passed as a size_t

length to receive_filter() and vringh_iov_push_iotlb(). A negative error

can therefore become a large length in the RX path.

Handle non-positive pull results before every length use. Count the TX

error and complete the consumed TX descriptor with zero bytes.

I found this bug myself, though the patch was written with AI assistance.

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/0d195797a80b77f2ec56718cd26d3ee65d0093e8Refgit.kernel.org/stable/c/1b803d382cde6d85755b363f22010208a04ba40aRefgit.kernel.org/stable/c/2bbf1c1f69991e28787e02b0a2f826289d5fc730Refgit.kernel.org/stable/c/3af20238a09ca180d66623e3bed16b64e9975f39Refgit.kernel.org/stable/c/c001abcde865b74231da8f1412c3217dbf66781e

How CyberStrike helps

Frequently asked questions

What is CVE-2026-97990?

CVE-2026-97990 is a high-severity vulnerability. It was published on September 25, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-97990?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-97990?

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-2026-97990?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-97990 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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