# CVE-2023-53569: linux: In the Linux kernel, the following vulnerability has been resolved:  ext2: Check block size validity during mount  Ch...

CVE-2023-53569 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-53569, released October 4, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-53569
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 4, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  ext2: Check block size validity during mount  Check that log of block size stored in the superblock has sensible value. Otherwise the shift computing the block size can overflow leading to undefined behavior.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.37-1 | [DEBIAN-CVE-2023-53569](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53569.md) | Oct 4, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.3.7-1 | [DEBIAN-CVE-2023-53569](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53569.md) | Oct 4, 2025 |
| Linux | linux Debian 14 | 6.3.7-1 | [DEBIAN-CVE-2023-53569](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53569.md) | Oct 4, 2025 |

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Data as of 2026-11-08T06:59:42Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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