# CVE-2021-3743: Information disclosure in Kernel

> A local attacker can exploit an out-of-bounds memory read in the Qualcomm IPC router to leak kernel information or crash the system.

- **Severity:** High 7.1 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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:** 4 Mar 2022
- **Updated:** 3 Aug 2024
- **Also known as:** A-224080927, AZL-8921, DEBIAN-CVE-2021-3743, GHSA-5g47-45xh-p83v, PUB-A-224080927, UBUNTU-CVE-2021-3743

## What is CVE-2021-3743?

CVE-2021-3743 is a high-severity vulnerability in Fedoraproject Fedora, published on 4 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An out-of-bounds (OOB) memory read flaw was found in the Qualcomm IPC router protocol in the Linux kernel. A missing sanity check allows a local attacker to gain access to out-of-bounds memory, leading to a system crash or a leak of internal kernel information. The highest threat from this vulnerability is to system availability.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2021-3743?

It affects 13 products.


Products: Fedoraproject Fedora, Linux kernel, Netapp H300e Firmware, Netapp H300s Firmware, Netapp H410c Firmware, Netapp H410s Firmware, Netapp H500e Firmware, Netapp H500s Firmware, Netapp H700e Firmware, Netapp H700s Firmware, Oracle Communications Cloud Native Core Binding Support Function, Oracle Communications Cloud Native Core Network Exposure Function, Oracle Communications Cloud Native Core Policy.

## How do I fix CVE-2021-3743?

Apply the vendor's patch.

## Is CVE-2021-3743 being exploited?

There is no known exploitation of CVE-2021-3743 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-3743 and fix it if it is affected.

What it is: CVE-2021-3743 is a high-severity vulnerability in Fedoraproject Fedora, published on 4 Mar 2022. 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-2021-3743 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2021-3743/ (Markdown: https://insights.sbomify.com/CVE-2021-3743/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-3743
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-3743
- OSV: https://osv.dev/vulnerability/CVE-2021-3743

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-3743/
Summaries are generated and may contain mistakes; the official description above is the record.