Medium [CVE-2026-64157] Fix partial invalidation of streaming-write folio
This medium-severity Red Hat Linux advisory covers CVE-2026-64157 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 partial invalidation of streaming-write folio In netfs_invalidate_folio(), if the region of a partial invalidation overlaps the front (but not all) of a dirty write cached in a streaming write page (dirty, but not uptodate, with the dirty region tracked by a netfs_folio struct), the function modifies the dirty region - but incorrectly as it moves the region forward by setting the start to the start, not the end, of the invalidation region.
A flaw was found in the Linux kernel's network file system (netfs) component. This vulnerability allows for incorrect handling of data during partial invalidation operations on streaming-write pages.
An attacker could potentially exploit this to cause data corruption or unexpected system behavior, impacting data integrity. This vulnerability is rated as Moderate because exploitation requires local authenticated access with standard user privileges and is restricted to causing data inconsistency or system instability rather than arbitrary code execution.
The issue originates in the network filesystem (netfs) caching framework during partial invalidation of streaming writes. Red Hat Enterprise Linux 8 and 9 are unaffected as they lack the newer streaming-write implementation.
Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-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 · medium-confidence parse· fetched 6 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 6 days ago·verify at source
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