CVE-2026-98843

/// Technical description

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

netfs: zero gaps in read-gaps folio to avoid writing back stale data

netfs_read_gaps() leaves gaps around a streaming write's dirty region

unread on the server side, so a short/EOF response there left stale

folio content that later got written back.

Zero it after the read completes, not before: netfs_wait_for_read()

returns rreq->transferred once ret >= 0, so build an iterator over the

same bvec array the read used, advance past ret, and zero the rest.

The dirty region already maps to sink pages in that array rather than

the real folio, so this can't touch it, and only the actual shortfall

gets zeroed instead of the whole gap upfront.

/// 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