Medium [CVE-2026-64058] Fix netfs_read_folio to wait on writeback
This medium-severity Red Hat Linux advisory covers CVE-2026-64058 affecting Red Hat Enterprise Linux 10, Red Hat package: kernel.
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Summary
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix netfs_read_folio() to wait on writeback Fix netfs_read_folio() to wait for an ongoing writeback to complete so that it can trust the dirty flag and whatever is attached to folio->private (folio->private may get cleaned up by the collector before it clears the writeback flag).
A flaw was found in the Linux kernel's network file system (netfs) component.
This can lead to the system incorrectly trusting the dirty flag and prematurely cleaning up private data associated with a folio, potentially resulting in data integrity issues or unexpected system behavior. netfs_read_folio() could inspect dirty state and folio private data while writeback was still in progress.
The writeback collector may clean folio private before the writeback flag is cleared, so a concurrent read path can make decisions using inconsistent folio state. For the CVSS the PR:L is used because a local process with access to files on an affected netfs backed mount is needed to trigger the read/writeback race.
The issue is not directly network reachable even though the backing filesystem may use network storage. Impact is primarily local data integrity loss or I/O disruption.
Red Hat severity: Moderate — CVSS 4.7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-362.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
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