# CVE-2026-89837: f2fs: fix dentry folio leak in find_in_level

CVE-2026-89837 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-89837, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-89837
- Priority: High
- CVSS: 7.1 (Moderate)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 16, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89837

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.113-1 | [DEBIAN-CVE-2026-89837](https://patchblox.com/security/data/fix/linux/debian-cve-2026-89837.md) | Sep 23, 2026 |
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-89837](https://patchblox.com/security/data/fix/linux/debian-cve-2026-89837.md) | Sep 23, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.113-1~deb12u1 | [DEBIAN-CVE-2026-89837](https://patchblox.com/security/data/fix/linux/debian-cve-2026-89837.md) | Sep 23, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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