CVE-2026-63820
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix missing read bio submission on large folio error f2fs_read_data_large_folio() can keep a read bio across multiple rea…
Overview
CVE-2026-63820 is a known-severity vulnerability. It was published on July 19, 2026.
Technical description
In the Linux kernel, the following vulnerability has been resolved:
f2fs: fix missing read bio submission on large folio error
f2fs_read_data_large_folio() can keep a read bio across multiple
readahead folios. If a later folio hits an error before any of its
blocks are added to the bio, folio_in_bio is false and the current error
path returns immediately after ending that folio.
This can leave the bio accumulated for earlier folios unsubmitted. Those
folios then never receive read completion, and readers can wait
indefinitely on the locked folios.
Route errors through the common out path so any pending bio is submitted
before returning. Stop consuming more readahead folios once an error is
seen, and only wait on and clear the current folio when it was actually
added to the bio.
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.
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Frequently asked questions
What is CVE-2026-63820?
CVE-2026-63820 is a known-severity vulnerability. It was published on July 19, 2026.
How severe is CVE-2026-63820?
CVSS score information is not yet available for this vulnerability. Check back as the CVE record is updated by NVD analysts.
How do I fix or remediate CVE-2026-63820?
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-2026-63820?
CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63820 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.