The vulnerability in the Linux kernel's netfs component relates to the netfs_invalidate_folio() function, which incorrectly updates the dirty region of a streaming-write folio during partial invalidation. Specifically, when the invalidation region overlaps the front portion of a dirty write cached in a streaming write page, the function erroneously sets the start of the dirty region to the start of the invalidation region instead of its end. This incorrect adjustment could lead to improper handling of cached data. The fix involves setting finfo->dirty_offset to the end of the invalidation region (iend), ensuring correct tracking of the dirty region.

The vulnerability does not impact confidentiality or integrity but affects availability, as indicated by the CVSS vector (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). This suggests that a local attacker with low privileges could cause a denial of service or system instability by exploiting the improper handling of streaming-write folios.

No explicit patch links or vendor advisory details are provided in the input. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since this is a Linux kernel vulnerability, users should monitor official Linux kernel releases and apply updates that address CVE-2026-64157 when available.