# CVE-2023-1637: Information disclosure in Kernel

> A local attacker can exploit speculative execution flaws in Linux kernel CPU power management to read unauthorized CPU memory.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **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:** 27 Mar 2023
- **Updated:** 19 Feb 2025
- **Also known as:** DEBIAN-CVE-2023-1637, GHSA-3hpj-266f-m43f, UBUNTU-CVE-2023-1637

## What is CVE-2023-1637?

CVE-2023-1637 is a medium-severity vulnerability in Linux kernel, published on 27 Mar 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A flaw that boot CPU could be vulnerable for the speculative execution behavior kind of attacks in the Linux kernel X86 CPU Power management options functionality was found in the way user resuming CPU from suspend-to-RAM. A local user could use this flaw to potentially get unauthorized access to some memory of the CPU similar to the speculative execution behavior kind of attacks.

Weakness: CWE-212 (Improper Removal of Sensitive Information Before Storage or Transfer), CWE-226 (Sensitive Information in Resource Not Removed Before Reuse)

## Which versions are affected by CVE-2023-1637?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2023-1637?

Apply the vendor's patch.

## Is CVE-2023-1637 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-1637 exists.

## 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-2023-1637 and fix it if it is affected.

What it is: CVE-2023-1637 is a medium-severity vulnerability in Linux kernel, published on 27 Mar 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-1637 exists.

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-2023-1637/ (Markdown: https://insights.sbomify.com/CVE-2023-1637/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-1637
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-1637
- OSV: https://osv.dev/vulnerability/CVE-2023-1637

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-1637/
Summaries are generated and may contain mistakes; the official description above is the record.