CVE-2026-80897
Received Received - Intake

netfs Readahead Folio Reference Leak Fix

Publication date: 2026-09-04

Last updated on: 2026-09-04

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: netfs: release readahead folios on iterator preparation failure netfs_prepare_read_iterator() batches readahead folios in put_batch so that the folio references can be dropped after the I/O iterator has been prepared. If rolling_buffer_load_from_ra() fails after earlier folios have been batched, the function returns immediately and leaves those references held. Release the batch before returning the error.

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Meta Information

Published
2026-09-04
Last Modified
2026-09-04
Generated
2026-09-05
AI Q&A
2026-09-04
EPSS Evaluated
N/A
NVD
CVE-2026-80897
EUVD
EUVD-2026-71647

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves a failure to release readahead folios when preparing an I/O iterator fails. Specifically, if netfs_prepare_read_iterator() encounters an error after batching folios, it returns immediately without releasing those folio references, potentially causing memory leaks.

Impact Analysis

This vulnerability could lead to memory leaks in the Linux kernel, which may cause system instability or crashes over time due to unmanaged memory usage. It primarily affects systems using the netfs subsystem for file I/O operations.

Mitigation Strategies

Update the Linux kernel to the latest stable version where this vulnerability has been patched. Monitor kernel updates from your distribution vendor and apply them promptly.

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