CVE-2026-64157: netfs: Fix partial invalidation of streaming-write folio

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-19 · updated 2026-08-17

Description

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. Fix this by setting finfo->dirty_offset to the end of the invalidation region (iend).

Affected products

Linux kernel: from 6.10.8 before 6.11; from 6.11.1 before 6.12.92; from 6.13 before 6.18.34; from 6.19 before 7.0.11; 6.11, 6.11-rc6, 6.11-rc7, 7.1-rc1, 7.1-rc2, 7.1-rc3 (+1) — fixed in 6.11, 6.12.92, 6.18.34, 7.0.11

How to fix

Upgrade to a fixed version: Linux kernel 6.11, 6.12.92, 6.18.34, 7.0.11. Check the vendor advisory for mitigations.

References

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