# CVE-2026-90419: nilfs2: prevent out-of-bounds read in super root block parsing

CVE-2026-90419 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-90419, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-90419
- Priority: High
- CVSS: 7.1 (Moderate)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 17, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90419

## Description

In the Linux kernel, the following vulnerability has been resolved:  nilfs2: prevent out-of-bounds read in super root block parsing  super-root inode metadata size is trusted before nilfs_read_inode_common().  Reject super-root inode sizes whose computed on-disk footprint exceeds the filesystem block size. This prevents malformed filesystem images from making nilfs_read_inode_common() read past the end of the super-root block.  [ryusuke: clarify the commit title]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.190-1 | [DEBIAN-CVE-2026-90419](https://patchblox.com/security/data/fix/linux/debian-cve-2026-90419.md) | Sep 23, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.111-1 | [DEBIAN-CVE-2026-90419](https://patchblox.com/security/data/fix/linux/debian-cve-2026-90419.md) | Sep 23, 2026 |
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-90419](https://patchblox.com/security/data/fix/linux/debian-cve-2026-90419.md) | Sep 23, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.111-1~deb12u1 | [DEBIAN-CVE-2026-90419](https://patchblox.com/security/data/fix/linux/debian-cve-2026-90419.md) | Sep 23, 2026 |

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Data as of 2026-11-09T07:25:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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