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CVE-2026-89602

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: erofs: skip sufficiently large global buffers when resizing z_erofs_gbuf_nrpages is advanced only after every global buffer has…

Published Sep 11, 2026EPSS 0.18%

Overview

CVE-2026-89602 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, 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:

erofs: skip sufficiently large global buffers when resizing

z_erofs_gbuf_nrpages is advanced only after every global buffer has been

grown. If a resize fails after some buffers were enlarged, a retry

revisits those enlarged buffers.

Retrying the same size then returns -ENOMEM because alloc_pages_bulk()

has no pages to add and the unchanged return value is treated as a

failure. Retrying an intermediate size allocates a temporary pointer

array smaller than gbuf->nrpages and copies more existing pointers than

the array can hold.

Skip buffers that already satisfy the request. Once all remaining

buffers have caught up, advancing z_erofs_gbuf_nrpages again describes

the guaranteed minimum size across the pool.

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/3fbdd15d5830f52661eb78be95058d101cb0c2cbRefgit.kernel.org/stable/c/7267557ce98ccd07faaf3bc86382448950cc4ff6Refgit.kernel.org/stable/c/7f4a89d4f0d6acaf4b756c31de48f2109a257b70Refgit.kernel.org/stable/c/a7d097cf01301c5da37927c8f26123d006f0fd8a

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89602?

CVE-2026-89602 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-89602?

This vulnerability has a CVSS 3.1 base score of 7.8, 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-2026-89602?

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-2026-89602?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89602 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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