# DLA-4379-1: linux-6.1 security update

DLA-4379-1, released November 25, 2025, fixes 1 CVE in linux-6.1 (version 6.1.158-1~deb11u1). None of them is reported as exploited. Patch Radar priority: High. The product is no longer supported.

- Web page: https://patchblox.com/security/fix/linux/dla-4379-1
- Platform: Linux
- Released: Nov 25, 2025
- Priority: High (Closes CVE-2025-21861, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://security-tracker.debian.org/tracker/CVE-2025-21861

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [linux-6.1](https://patchblox.com/security/data/product/linux/linux-6.1.md) | Debian 11.6 (bullseye) | 6.1.158-1~deb11u1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2025-21861](https://patchblox.com/security/data/cve/CVE-2025-21861.md) | High | kernel: The kernel packages contain the Linux kernel, the core of any Linux operating system | 7.8 | 0.0024 |  |

---

Data as of 2026-11-07T06:34:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo