# CVE-2026-74693: net: prestera: validate firmware header length

CVE-2026-74693 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-74693, released August 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-74693
- Priority: Routine
- CVSS: 4.4 (Moderate)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 22, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74693

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: prestera: validate firmware header length  prestera_fw_hdr_parse() reads the firmware header before checking that the firmware image contains that header.  Reject images shorter than struct prestera_fw_header before decoding the magic and version fields.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.187-1 | [DEBIAN-CVE-2026-74693](https://patchblox.com/security/data/fix/linux/debian-cve-2026-74693.md) | Aug 27, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.105-1 | [DEBIAN-CVE-2026-74693](https://patchblox.com/security/data/fix/linux/debian-cve-2026-74693.md) | Aug 27, 2026 |
| Linux | linux Debian 14 | 7.1.9-1 | [DEBIAN-CVE-2026-74693](https://patchblox.com/security/data/fix/linux/debian-cve-2026-74693.md) | Aug 27, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.107-1~deb12u1 | [DEBIAN-CVE-2026-74693](https://patchblox.com/security/data/fix/linux/debian-cve-2026-74693.md) | Aug 27, 2026 |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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