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CVE-2026-89841

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: f2fs: only redirty pinned folios in redirty_blocks redirty_blocks() pins folios with read_cache_folio() and then walks the same…

Published Sep 16, 2026EPSS 0.17%

Overview

CVE-2026-89841 is a high-severity vulnerability. It was published on September 16, 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. Some level of privileges is required for exploitation.

Technical description

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

f2fs: only redirty pinned folios in redirty_blocks

redirty_blocks() pins folios with read_cache_folio() and then walks the

same range again with filemap_lock_folio() to redirty them and drop the

references it took.

Commit 5951fee46bef ("f2fs: Use a folio in redirty_blocks()") changed

the second pass to a do/while loop. If read_cache_folio() fails before

anything is pinned, page_idx does not advance but the cleanup loop still

runs once.

If readahead has already populated the failed folio in page cache, that

extra iteration finds it and folio_put_refs(folio, 2) drops one

reference too many. Later drop_caches or reclaim can then report

"BUG: Bad page state".

Only redirty the range that was pinned successfully.

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/445e4a1e6025ecd5312e9a95c1b234192c976ca1Refgit.kernel.org/stable/c/85171332742e741ccd6f401c69b6e0d698119e72Refgit.kernel.org/stable/c/89c65ec3c18903de763cf567c96ab3ef60e5f3b0

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89841?

CVE-2026-89841 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-89841?

This vulnerability has a CVSS 3.1 base score of 7.8, 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-2026-89841?

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-2026-89841?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89841 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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