# CVE-2026-97487: jfs: handle set_blocksize failures

CVE-2026-97487 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-97487, released September 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-97487
- Priority: Routine
- CVSS: 4.4 (Moderate)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 24, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97487

## Description

In the Linux kernel, the following vulnerability has been resolved:  jfs: handle set_blocksize failures  jfs 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.190-1 | [DEBIAN-CVE-2026-97487](https://patchblox.com/security/data/fix/linux/debian-cve-2026-97487.md) | Sep 24, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.111-1 | [DEBIAN-CVE-2026-97487](https://patchblox.com/security/data/fix/linux/debian-cve-2026-97487.md) | Sep 24, 2026 |
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-97487](https://patchblox.com/security/data/fix/linux/debian-cve-2026-97487.md) | Sep 24, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.111-1~deb12u1 | [DEBIAN-CVE-2026-97487](https://patchblox.com/security/data/fix/linux/debian-cve-2026-97487.md) | Sep 24, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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