# CVE-2020-10773: Information disclosure in kernel

> A local attacker can read kernel data due to a stack information leak in the s390/s390x memory manager.

- **Severity:** Medium 4.4 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 10 Sep 2020
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2020-10773, GHSA-3wp9-9gg6-rwqx, UBUNTU-CVE-2020-10773

## What is CVE-2020-10773?

CVE-2020-10773 is a medium-severity vulnerability in Linux kernel, published on 10 Sep 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A stack information leak flaw was found in s390/s390x in the Linux kernel’s memory manager functionality, where it incorrectly writes to the /proc/sys/vm/cmm_timeout file. This flaw allows a local user to see the kernel data.

Weakness: CWE-626 (Null Byte Interaction Error (Poison Null Byte))

## Which versions are affected by CVE-2020-10773?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2020-10773?

Apply the vendor's patch.

## Is CVE-2020-10773 being exploited?

There is no known exploitation of CVE-2020-10773 in the wild and no public exploit code.

## Other vulnerabilities in Linux kernel

- [CVE-2026-53266](https://insights.sbomify.com/CVE-2026-53266/): Linux Kernel Out-of-Bounds Write (high 8.8, exploited in the wild)
- [CVE-2013-6282](https://insights.sbomify.com/CVE-2013-6282/): Linux Kernel Improper Input Validation (high 8.8, exploited in the wild)
- [CVE-2022-0185](https://insights.sbomify.com/CVE-2022-0185/): Linux Kernel Heap-Based Buffer Overflow (high 8.4, exploited in the wild)
- [CVE-2013-2094](https://insights.sbomify.com/CVE-2013-2094/): Linux Kernel Privilege Escalation (high 8.4, exploited in the wild)
- [CVE-2026-53362](https://insights.sbomify.com/CVE-2026-53362/): Linux Kernel Unspecified (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-10773 and fix it if it is affected.

What it is: CVE-2020-10773 is a medium-severity vulnerability in Linux kernel, published on 10 Sep 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-10773 in the wild and no public exploit code.

Affected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-10773/ (Markdown: https://insights.sbomify.com/CVE-2020-10773/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-10773
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-10773
- OSV: https://osv.dev/vulnerability/CVE-2020-10773

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-10773/
Summaries are generated and may contain mistakes; the official description above is the record.