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CVE-2026-89954

8.0 · HIGH

In the Linux kernel, the following vulnerability has been resolved: mtd: afs: validate v2 image info bounds The AFS v2 parser uses footer[8] to locate the image information block inside the curre…

Published Sep 16, 2026EPSS 0.18%

Overview

CVE-2026-89954 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 8.0 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.0, 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:

mtd: afs: validate v2 image info bounds

The AFS v2 parser uses footer[8] to locate the image information block

inside the current erase block, then uses the image information

region_count to walk entries from a fixed local array. The footer offset

and region count come from flash contents and are not checked against the

erase block or the local image-info array before use.

Reject v2 entries whose image information offset would underflow the

erase block calculation, and reject region counts that cannot fit in the

local image-info array before walking region entries.

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/18916f475057cbd2fb8ea6ae86e6b85884ad1d53Refgit.kernel.org/stable/c/1bec05a68414cf8d0cab6cb42445b8603f32ffc4Refgit.kernel.org/stable/c/1edea8900ca3e405c1421d8b5c29f97107874f72Refgit.kernel.org/stable/c/3ad8ff12fd44b08af9212ac4883a7e29d2ab7348Refgit.kernel.org/stable/c/875daa3c750814ff2e2dc050239c390048f0bcd0Refgit.kernel.org/stable/c/d14e6298139f58a87a87d7022e26a7f37f0ddce7Refgit.kernel.org/stable/c/da740539e8f370767317e24615349b9342a6e773Refgit.kernel.org/stable/c/e9290031f736e99ad17c25c00311c92c266843b7

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89954?

CVE-2026-89954 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 8.0 (HIGH).

How severe is CVE-2026-89954?

This vulnerability has a CVSS 3.1 base score of 8.0, 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-2026-89954?

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-2026-89954?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89954 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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