# CVE-2020-11884: Race condition in n/a

> A race condition in the Linux kernel s390 platform allows attackers to achieve code execution or cause a denial of service via concurrent page table upgrades.

- **Severity:** High 7.0 (`CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 29 Apr 2020
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2020-11884, GHSA-grcc-xgjx-xwf8, UBUNTU-CVE-2020-11884, USN-4343-1

## What is CVE-2020-11884?

CVE-2020-11884 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 29 Apr 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In the Linux kernel 4.19 through 5.6.7 on the s390 platform, code execution may occur because of a race condition, as demonstrated by code in enable_sacf_uaccess in arch/s390/lib/uaccess.c that fails to protect against a concurrent page table upgrade, aka CID-3f777e19d171. A crash could also occur.

Weakness: CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization)

## Which versions are affected by CVE-2020-11884?

It affects 23 products.


Products: Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Linux kernel, Netapp A700s Firmware, Netapp Active Iq Unified Manager, Netapp Bootstrap Os, Netapp Cloud Backup, Netapp Element Software, Netapp H300e Firmware, Netapp H300s Firmware, Netapp H410c Firmware, Netapp H410s Firmware, Netapp H500e Firmware, Netapp H500s Firmware, Netapp H610c Firmware, Netapp H610s Firmware, Netapp H700e Firmware, Netapp H700s Firmware, Netapp Hci Management Node and 3 more.

## How do I fix CVE-2020-11884?

Apply the vendor's patch.

## Is CVE-2020-11884 being exploited?

There is no known exploitation of CVE-2020-11884 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-11884 and fix it if it is affected.

What it is: CVE-2020-11884 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 29 Apr 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-2020-11884 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. 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-2020-11884/ (Markdown: https://insights.sbomify.com/CVE-2020-11884/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-11884
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-11884
- OSV: https://osv.dev/vulnerability/CVE-2020-11884

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-11884/
Summaries are generated and may contain mistakes; the official description above is the record.